Hello, poiseandpen, and welcome to Psych Central! I have Bipolar along with some painful medical issues. I see a therapist and a psychiatrist and both say that pain and depression go together. And I can certainly attest to that.
I also see a pain doctor. Why is yours opposed to muscle relaxants?
I take Tramadol, Hydrocodon-Tylenol, and Cymbalta for my pain. I also take Wellbutrin, Kolonopin, and Trazodone for my bipolar/anxiety.
I just started taking the Cymbalta on top of everything else and am pleased with the results. It is also an antidepressant and helps with anxiety. Maybe you can ask your doc about it.
Keep in touch. I hope you feel less pain and therefore less depression soon. I do know depression is associated with MS, too.