So last night i was feeling ill . Very weak and of course the shortness of breath . Too a hot bath for a while just to calm myself down . I started to feel better . When i went to bed i jumped up out of my sleep about an hour later literally feeling ill like i was about to die i got up and walked around for a few . I had the shortness of breath and the impending doom feeling . I layed back down still feeling bad and immediately after falling back asleep i jumped back up with the same feeling . I was so scared i seriously thought i was about to die . But i figured if i was going to die i would die in my sleep instead of waking up and dieing lol . But this has really scared me . When i woke up for work i was feeling ok still short of breath and a little worried . But what could this be ? Has this ever happened to anybody else ?