Hi,
I, too, have alot of stomach problems associated with my panic. Sometimes my stomach hurts, dull ache kind of pain, and other times it's a pressure feeling. I also experience random pain in my chest, back, headaches, etc. I've been told that it is due to tensing of the muscles in that area when I am stressed. Have you been to the doctor about your symptoms, or the panic attack you've experienced? That should be the place to start just to rule out any physical problem. I hope that this helps. I'm around if you need to talk.
Junebug