just thinking...

Mark, did you ever read the info. about Central Pain Syndrome that mrsD left you on another thread?

If you had earlier had a stroke followed by a concussion then this situation with the medications might have exacerbated everything.

http://www.ninds.nih.gov/disorders/c...ntral_pain.htm

Central Pain Syndrome

central post-stroke pain
central post-stroke syndrome

Edited to add: I see you've now listed some of your symptoms in your sig..
Don't forget it is possible that not all those symptoms are caused by one event.
In your case they could be the result of several serious incidents.
Plus the anxiety (and the depression) is so common with TBI/PCS and part and parcel unfortunately of post concussion syndrome as you would know already.