Have you read Mindbody Prescription by Dr. John E. Sarno?
It's the only thing that could cure my constant RSI/chronic pain after years of trying everything, and in the book he talks about fibromyalgia.
http://www.amazon.com/The-Mindbody-Prescription-Healing-Body...
The idea of psychogenic disorders would have normally have sounded like esoteric BS to me, but I ended up picking up the book at the recommendation of an ex-Google coder who went through all the same things that I did. I'm glad I did; for 15$, I completely cured myself after years of trying everything else (physiotherapy, standing desk, stretching exercises, working out, various books on RSI, ergonomic chairs, keyboards, mouses, trackpads, switching hands, etc, etc), and it turns out the book takes a very scientific approach to these conditions, even if it admits that there's a lot we still don't understand about exactly how our minds work and how they can affect our bodies (it's kind of an engineering approach -- we figured out something that works, now we need to figure out why).
Highly recommended to all those of you suffering from constant back pain, neck pain, RSI, etc.