. If you thought lady gaga was done making melodies, it was just a Perfect Illusion. The singer has released her first pop single in three years. But first, the nightline 5. Good evening. Thank you for joining us. Tonight were take a very personal and hopeful look at a disease that affects the lives of millions of americans. Alcoholism. Our own Elizabeth Vargas revealing for the first time to diane sawyer the depths of her addiction and the toll it took on her marriage, her children, and her career. And the moment she knew she had to stop drinking. There are days when you wake up and you feel so horrible that the only thing that will make you feel better is more alcohol. Thats when people die. How close did you come to dying . I on one occasion had what i know to be a lethal level of alcohol in my blood system. And even that didnt scare me into stopping. Reporter for decades a Network Correspondent and anchor. Tonight were taking you reporter 20 20s Elizabeth Vargas was known for her s