This is when a person continues to be freaked out by a bad experience that they've had in the past. People think that post traumatic stress only happens to war veterans, but that's not the case. It can happen to anyone who has seen or experienced horrible stuff like a car accident, abuse, or some other sort of disaster. If you suffered from post traumatic stress you might experience:
Like all of the other anxiety problems you can get help to get over post traumatic stress (hit here for the help page to find out some contacts of people who could give you a hand).