tums vs. mozzarella stick who knew it could when heartburn hits, fight back fast with tums chewy bites. fast heartburn relief in every bite. crunchy outside, chewy inside. tums, tums, tums, tums tums chewy bites it s been over four years since a still unexplained phenomenon affected more than 200 diplomats, intelligence officers and other government personnel based in cuba. the strange set of symptoms have been dubbed havana syndrome. now for the first time three of the original victims of havana syndrome have told nbc what it feels like. here is nbc news chief foreign affairs correspondent andrea mitchell. reporter: in march of 2017,