I would get a second opinion. Fibromyalgia can be quite painful.
My fibro was horrific for 8 long years and finally in May 2008 I tried an anti-inflammatory diet to restart my digestive tract (as inflammation begins in the stomach and migrates throughout the body to the cellular level). Inflammation in the body ='s pain and another thing...cancer likes inflammation.
I stuck to the diet for 4 weeks as recommended and then began to re-introduce other foods one at a time to see how my body would react. Within the first couple of weeks my pain went from a 10 to 0...no kidding. Ice cream will bring it back to a 7.
Processed foods are the worst for patients who suffer from fibro as well as all cow's dairy.
You do not need nor want a doctor who does not believe what you are going through. Empower yourself, 2nd opinion froma physician who is on the same page as you and who will listen & treat you with respect. Remember you are in charge of your health, so fire the ones that can't or won't do their job.
Best wishes for a speedy recovery.
Zig