Kash Alvaro stared at the ceiling of an emergency room in January listening to the beep of an EKG monitor for what he guessed was the 80th time in 12 months. The once-healthy Afghanistan War veteran had collapsed in a hallway that night, then awakened confused in an ambulance and lurched up in alarm, swinging and yelling until the paramedics held him down and injected sedatives. Now he lay alone in a room at Memorial Hospital, quietly weeping.