Hi there, I just want to say I'm really sorry you're struggling so much. I have been in a bipolar depression for over a year now and also suffer from migraines and fibromyalgia. I know what it is like to feel like you never experience relief.
I would recommend what the previous poster did: if your current pain management doctor won't even prescribe muscle relaxers, which you have found to help you, can you find another doctor?
Best wishes for you finding some relief!