How do I overcome PTSD with phobias and panic attacks?

About eight years ago when I was 21, I was badly injured, and became quite emotionally unstable. I don't want to discuss the details of the injury. I grew steadily more agoraphobic, but all the while tried to maintain a normal life. I feel exhausted now, but a lot more stable, and am starting to have friends again. I still have difficulty with panic attacks though. Any suggestions?