Sounds pretty normal to me. I don't know if it's PTSD or a panic attack or both, but I've lived with those symptoms off and on all of my adult life. Try not to let it worry you. After it happens enough I started to realize it wouldn't kill me, I was not dying, and just kind of learned to live with it. Then about 10 years ago I found medication that actually helped. Zoloft, most recently cymbalta, along with Klonopin. Good luck!