It is really common to have these post traumatic like reactions after going through all you have been through. You seem well informed about medication options which can be helpful. 2 other things that have been GREAT help: EMDR(cant remember what it stands for, Eye Movement something something). It is a technique taught to interrupt the anxiety/stress pathway, usually can be learned in 1-2 sessions with a trained person. Here in Vermont, the folks who do this are therapists but I bet you could find more info on line. I have seen this DRAMATICALLY help decrease stress response, panic attacks and post traumatic stress responses from many different sources....
The other thing is to find someone who does either network chiropractor or a massage therapist who does reiki like technique to help soothe your neurological system. Good luck! Hope your test results continue to be positive. Martha