I've been where you've been. I used to have terrible panic attacks exactly like you described. They were so scary, that they would continue at random times, and it caused me post traumatic stress disorder as well. That was when I was 13. I was prescribed Paxil, it fixed it, and I've been on Paxil ever since, and now I'm going to be 17 in a few days. I'm going to quit Paxil though, since I don't feel I need it, now that I don't have panic attacks.