hi....just thought id add my experience...i know what you are feeling is very scary...i have felt it before. i have ptsd too and did...but the two times that i have gone through the fears you express there were medical reasons...one was from a drug i was on...prednisone and the second time was when my thyroid was extremely overactive for quite awhile...so i really hope you go for help and i hope they look at all possibilities. be well....kasva