I used to wake up in the middle of the night with horrable anxiety attacks severe nausa would come over me and I would bolt out of bed. Several times when I jumped out of bed trying to get to the bathroom I would pass out. The worst time was a passed out in the hall, and hit the wood floor, that was a trip to the er, and required several stitches in my chin. A bad dream would trigger this. I used to have anxiety attacks and I could not breath, despirately trying to suck in air, sometimes it would take several hours for it to subside. This would occur if something very stressful had happened to me, I had a bad on on an airaplane once retuning home from my daughters wedding, lots of baggage there having to confront my x husband. The meds I am on now has helped me, I haven’t had one of these attacks in several years.