I was going to ask if you considered anything like biofeedback, or even hypnosis, and some antidepressants may enhance the pain med effectiveness.

Have you had any sort of physical therapy at all - ultra sound, electric stim (IF stim, TENS ets), therapeutic massage or low level laser also called soft/cold laser.
Some chiros have those lasers it might be worth a try to find one and see it LLLT helps.