So this happens to me every now and then usually only for a day or so but at its worst for a week making me get about an hour of sleep a night for a week, and as I woke up a few minutes ago and this was happening just wanted to vent a little and see if anyone has anything similar.

Ocassianly when I'm trying to sleep or if I wake up in the night I will suddenly get completely terrified of going to sleep, convinced that as soon as I do I will have a heart attack and die in my sleep. And even though I know it's my brain doing this I can never seem to calm myself and usually have to find something to distract me for long enough to calm down enough to sleep again.