I've had years of stress that I thought I'd been handling well until recently caring for my mother until her passing. Since then I havent been able to bounce back and and been plagued with debilitating anxiety and depression. I've been investigating a condition called Adrenal Fatigue. You might want to check into it, too, if you've been stressed for a long time.
Just a thought.
BTW: my attacks come out of nowhere, too, and are the worst during my sleep! JEEZ!!
Post Edited (ForceTheHope) : 5/3/2016 2:35:36 PM (GMT-6)