have you been tested for hep c? that can cause the symptoms you describe. so can a million other things too, I'd have your liver enzymes checked.
That has been my life for the past three months. I went nuts, not about the symptoms, but about the fact that nobody had a clue how to help me, and I was really out of it. At times so much that I could not stand for even more than 5 minutes. It was the unspoken conclusion of the docs that it was all in my head. To prove them wrong, I took lorazepam, and the symtoms persisted. So one day, after lots of researching, I started an elimination diet. After six days of eliminating, my symptoms cleared up! I could not believe it!! Unfortunately, I got food poisoning before I could get through the rechallenge part, but once I started eating normally, the symptoms returned. Now I avoid food additives and certain other triggers, because I know they make me feel miserable.
The other causative factor was a chronic simus infection that I did not notice I had, or just got used to having. A short course of a strong antibiotic helped to clear up my residual symptoms of muscle pain, abdominal pain, temple pain, and all the rest.
This has worked for me, and your symptoms may have a different cause. But I'm putting this out there for you, because I know you have to think outside the box in order to find relief. Perhaps an alternative practitioner, or an allergy specialist may be able to assist you. Be discriminating when you choose them, though.