I'm so tired. But every time I try to sleep I'm convinced my heart is going to stop. My diaphragm and my chest have been tight since 1:00am and I feel like my upper body is on fire when I lay down. I know all the cardiac tests came back fine, I know I'm only 23, I know I'm probably fine and fear is a lie. But how the hell do I shut this off? "This time is just like last time, yeah, but you don't really know that for sure. This time it could be real." Can I get off this train with my sanity in tact?