make that choice. >> under pressure, think your job is stressful? bet it's nothing compared to this. just in time for march madness, we've got unprecedented behind the scenes access to a top college basketball coach. >> stress is probably the number one thing that kills you. >> dr. oz says there are lessons here for all of us. >> and the search is on for the black box that could solve the mystery of flight 370. but it's losing battery life with every passing minute. good evening. scientology has strenuously denied that it forces its members to quote, unquote, disconnect with anybody who leads the faith. cut all ties, even with loved ones. one woman says the church turned it into a choice between her son and her daughter. this is the image that most people have of scientology, tom cruise, john travolta and kirstey alley who lauded the religion as helping themselves out in their mind. this woman may have a less recognizable face, but she was a long-tim member who was coming forward with a very different story about scientology. >> i'm speaking out now because i don't want this to happen to other people. i don't want this to happen to other families. >> reporter: she blames the church for breaking apart her family effectively, she says, forcing her to choose between her son and daughter. >> no mother should ever have to make that choice. they were giving me a sophie's choice, and it's not right. >> reporter: shi says she spent 36 years in the church, founded by l. ron hubbard and she and her husband both reached the top level of spiritual progression known as operating satan eight. >> i was sort of the poster child for a signologist. >> but the problems began when her sonic developed doubts about the faith. >> you grow up in it so it's all you know. you believe whatever your parents tell you to believe, right? then when you reach adulthood, i mean, there's things i didn't like, the way they recruited, the theories about life and the universe. >> he was an engaged signtologist, actively recruiting people to the faith. >> i sold books. i didn't want to. i just did it because i had to. i kind of feel bad that i did that. he started associating with vocal critics of church. the head of the church had physically struck subordinates. >> he just takes off across the room in front of 80 people and delivered just a beating to the guy. i mean beat him up bad. >> reporter: the church has repeatedly and strenuously denied those allegations while condemning them as liars and apostates. he was cast out of the church, declared a quote, unquote, suppressive person. >> it was devastating. i mean, i felt the pain he felt. >> reporter: his mother says church officials repeatedly pressured her and her husband, also a signtologist needed to cut ties with her son. she briefly did sdis cdisconnec nick until she got drunk, got a gun and threatened to kill himself. >> i didn't have many reasons to stick around at the time. >> my son said i have a gun and i have. >> bottle of booze and a heart just drops and falls out of your chest. >> this contradicts the church's long-standing position that it does not tell its followers to cut ties with anyone. the accusations are untrue. the record shows the church acted with compassion, responding for requests from assistance including requests to help their son deal with a drug and alcohol addiction. >> the church is lying when they say there is no disconnection practice and enforced. it's not true. i have proof. >> reporter: in fact, goldberg gave us this document, one she first shared with the tampa bay times which broke the story in which a church official says he cannot approve of her continued relationship with her son, explicitly using the word disconnection. ultimately, she says, she and her husband chose to stand by nick. the result, she says, they were both called in front of what the church calls a committee of evidence and ultimately declared suppressive. at which point her daughter ashley chose to cut ties in what her mom describes as a wrenching scene. >> we talked and we cried and she said, mom, i have to d disconnect from you. it was just very sad. i know my daughter loves me and she loves her brother. so that was the last time i saw my daughter and my granddaughter. >> goldberg says she still believes in the teachings of scientology, but now shares her son's dougts abodoubts about ho church is being run, especially since she went online, something church members are discouraged from doing and saw what critics were saying about scientology. she saw this interview "nightline" gave with debbie cook, a former scientology official who claimed in court that the leader ordered his secretary to slap her. >> why? >> he was displeased with how i was answering a question. it wasn't what he wanted to hear in some way. >> scientology has labelled debbie cook a bitter apostate and liar. but goldberg says she was dee y ly troubled by cook's testimony. >> i started to understand why the church doesn't want its parishioners to go on the internet and read stuff. because there's too many things they would have learned. >> reporter: it's now been nine months since she had in contact with her daughter, son-in-law and granddaughter. >> it's just cruel. i can't even e-mail my daughter. i sent a package of presents to my granddaughter for christmas and it was refused and sent back. >> reporter: all that she has left is pictures and memories and hope. >> i want my family back. and i have wonderful memories. the evil practice of disconnection destroys families. it's got to stop. it's got to end. >> reporter: the latest installment in our series "faith matter" comingp next on ""nightline" exactly what happened to your body when you're stressed. we wire up a world famous stress ball for fascinating results. keep it here. ♪ [ male announcer ] your eyes. even at a distance of 10 miles... the length of 146 football fields... they can see the light of a single candle. your eyes are amazing. look after them with centrum silver. multivitamins with lutein and vitamins a, c, and e to support healthy eyes and packed with key nutrients to support your heart and brain, too. centrum silver. for the most amazing parts of you. eating healthier,tion by drinking plenty of water, but still not getting relief? try dulcolax laxative tablets. dulcolax is comfort-coated for gentle, over-night relief. dulcolax. predictable over-night relief you can count on. yeah. i heard about progressive's "name your price" tool? i guess you can tell them how much you want to pay and it gives you a range of options to choose from. huh? i'm looking at it right now. oh, yeah? yeah. what's the... guest room situation? the "name your price" tool, making the world a little more progressive. it's red lobster's lobsterfest! all promotions! the year's largest selection of lobster entrees, like lobster lover's dream. hurry in and sea food differently. go to red lobster.com for ten dollars off with purchase of two lobsterfest entrees. ♪ see what's new at projectluna.com stress. it's part of all of our lives. some of us believe we need it in order to maintain our edge, in fact, but any doctor will tell you too much stress is down right toxic. and so tonight, an experiment. we're going to wire up one of the most stressed out guys you have ever seen. a big-time college basketball coach gearing up for march madness. dr. oz says the results contain lessons for all of us. host of "sports science" on our sister network on espn has the report. >> reporter: this is coach tom iz izzo. >> a jumping jack and a double axel. >> one of the highest paid coaches in college basketball. in the heat of game, the pressure gets the best of him. >> it looks like he's enjoying his afternoon. >> that's how i feel. >>. >> reporter: it's all part of a long tradition of coaches who appear to be going mad. >> you're a liar, earl! >> reporter: he looks like he wants a technical. >>. >> reporter: and some go straight into full tilt metdown. >> you piece of [ bleep ]. >> just broke a stick over the ice. he lost his mind. >> reporter: coaches are no stranger to health issues. as seen in this dramatic video, nfl head coach gary kubiak suddenly collapsed on the field last season. a few years back, duke coach mike krzyzewski fainted in the middle of this game. but what is all this hair pulling, foot stomping and hand wringing do to one's health? >> i'm going to wire you up. >> to find out, "nightline" was granted unprecedented access top wire the michigan state coach during an actual game. tracking his breathing rate and heart rate. >> i just got to pop this in. >> pop that in. >> reporter: and we even had him swallow a sensor that tracks his core body temperature. so what do you expect to find out? >> i don't think anybody understands all the things that you go through. maybe the biggest one is stress. >> reporter: right. >> and it's probably one of the harder ones to measure. >> reporter: tom's wife lupe knows the drill. but what will our experiment reveal? is her husband's stressful job putting him at risk? >> there's so much that comes into the basketball program. so yeah, he's very stressed. >> we recruited two doctors, dr. redford williams, who joined me court side, and dr. oz back at the "nightline" lab, one of the nation's top cardiologists. >> one of the number one reasons for stress is you don't control the world outside of you. >> reporter: it's game time. at the start, coach izzo seems pretty calm, breathing easy. 14 breaths per minute. heart rate, 68 beats per minute. but as things get going, nerves kick in. his heart rises even from just hearing his own name being announced. >> tom izzo! >> reporter: when the imposing team scores the first basket, his heart immediately starts racing. >> if you suddenly jerk your heart rate up, things can happen. irregular heart beats that become permanent. they can be dangerous because they can cause strokes. they can make you faint. >> up to 122. the second basket. >> coach izzo's team is losing big time and it's having an impact on his body. >> there's definitely a correlation between the number of points they're down and his heart rate. >> his core body temperature has actually gone up. it's approaching 100. >> your body temperature isn't supposed to vary that much. it means that his body is feeling not only stress, but being fatigued by that stress. >> lays it in. >> reporter: izzo's team starts to rally. finally, izzo's heart gets a break. if things are going poorly, his heart rate goes up. if things are going well, his heart rate comes down. >> reporter: when the game starts up again, it doesn't look good for his team. >> he just blew his stack. 9:14 to go in the game. slammed the table. >> reporter: the referees start calling fouls. and izzo gets mad. really mad. >> izzo, izzo, izzo. >> reporter: in the control room, the crew finds izzo's reactions down right entertaining. but dr. oz says this is potentially dangerous. >> dealing with a quick sudden burst of anxiety like someone called you up and scared you about some news is one thing. having chronic stress that never gets better, that's even more detrimental. >> his heart is up to 130 now. >> reporter: his core body temperature climbs to 100 degrees and his heart rate spikes to a game high 135 beats per minute. that's 70% of his max heart rate, which is the same percentage experienced by a marathoner. and izzo hasn't even left court side. >> this is definitely not a laboratory experiment. i mean, this is in the real world. >> reporter: when it seems winning is out of reach, coach izzo's heart rate and body temp begin to taper off. almost as if his body is conceding defeat. >> the giving-up process allows your body to come down to a normal place. but that's, of course, what happens no matter what. whether you win or lose, your body quits. >> izzo's team, michigan state was supposed to win this game, but they lost by seven points. we met up with him the next day to show him the results of our unique experiment. >> hi, coach. a little bit of a tough game, but probably the ideal game for us to wire you up and take a look at what's really going on, right? >> upted to see disappointment, you know, maybe my heart stopped because of some of the things that went on. >> reporter: another play where you got a little upset, and this time you physically did a jump sp spin. you were very passionate. >> i loved gymnastics in the olympics. i wanted to see if i could do one of those 360s. it was kind of a poor version. i definitely thought there was a foul called on that critical, critical moment. >> reporter: coach izzo didn't seem surprised by the data we found during our real-time stress test. >> the italian in me, maybe emotions are worn more on the sleeve. if you came out with something positive, it might make my wife happy, my maker sad. the insurance policy is paid up. >> reporter: every time coach izzo's heart rate spiked, it quickly returned to a more normal level. this shows that his heart is in good shape. but it's this kind of internal roller coaster dangerous for your long-term health? >> the kind of chronic appearance can lead to longer term with your immune system, problems with blood pressure. the body feels it's always under attack. >> keeping calm isn't exactly in a coach's job description. >> stom is really passionate. he doesn't mix words. he says what he means, he means what he says. >> i don't try to hide my emotions very often. it gets me in trouble sometimes. most coaches have their moments, but i think that they've gotten this far because they can handle things, you know? because there's stressful things that happen each and every day in these jobs. >> reporter: for "nightline" in east lansing, michigan. >> speaking of basketball and pressure, it's time for march madness. tonight, many of you are filling out your bracket, including the first fan, president obama. who is naming michigan state as well as louisville, florida and arizona to go to the final four. for all of espn's bracketology including the president's pick for the national championship, tune into "sportscenter" starting wednesday at 9:00 a.m. eastern. coming up next as we enter the 12th day of urgent search for the missing malaysia airline flight 370, potential eyewitnesses who are just now coming forward. but last weekend there wasn't any hot water. his dad discovered bath time. lucky for him, there's tide coldwater. it has more powerful clean in cold so he doesn't need hot water to get a gorgeous clean. and it saves on the gas bill. enough for you to get your own robe? but i feel so good in this. you ought to try it! you want to try it? 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[ sneezes ] on the first day you take it. when jake and i first set out on we ate anything. but in time you realize the better you eat, the better you feel. these days we both eat smarter. and i give jake purina cat chow naturals. made with real chicken and salmon, it's high in protein like a cat's natural diet. and no added artificial flavors. we've come a long way. and whatever's ahead, we'll be there for each other. naturally. purina cat chow naturals. in the history of mankind. has one march. meant. so. much. your quicken loans college basketball bracket picks could change your life...forever. ♪ the quicken loans billion dollar bracket challenge with yahoo sports. pick a perfect bracket. win a billion dollars. enter today at quickenloansbracket.com. eating healthier,tion byars. drinking plenty of water, but still not getting relief? try dulcolax laxative tablets. dulcolax is comfort-coated for gentle, over-night relief. dulcolax. predictable over-night relief you can count on. >> 1 d1 days after malaysia's flight 370 went missing, we have possibly clues today. this fisherman said a jet barrelled by flying low and louder and larger than anything ehe's ever seen. new urgency for the plane's black box will only ping for about a month. meaning it's already lost about a third of its battery life. as time runs out, the search area still covers more than 2 million square nautical miles. ten times the size of texas. investigators are combing both land and sea in pursuit of the pings, in particular they're looking at this area off the west coast of australia. there may be still be hope even after the pings stop, though. when air france flight 447 went down in the atlantic ocean in 2009, the boxes were found almost two years later and they still held valuable information for investigators. that's going to do it for "nightline" tonight. we want to thank you for watching. "world news now" is coming up now. tune into gma first thing in the morning and as always, we're online at abcnews.com. good night. hello. raymond? even better. i'm robert, the brother. from humm vac cleaning systems international. oh, please, come in. thank you. ah, you must be raymond. yeah. hi. hi. i spoke to your wife last night about coming by to demonstrate our system. oh, right. yeah, oh, the vacuum. i thought she said that we didn't need a new vacuumum cleaner. yeah, she did. i remember because it was right before she told me that i have to go pick up something from somewhere. oh, you didn't happen to catch any of th, did you? sorry. yeah, so, when we spoke last night,, things did seem pretty hectic, so, since i happen to be in the neighborhood, i wondered if maybe now might be a good time to come show you how wonderful the humm vac is, and to offer you this complimentary lint brush. yeah. i don't know. my wife says i'm really not supposed to -- come on, ray. it's complimentary. may i, robert? this won't hurt a bit.

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