Have you seen a rheumatologist who specialises in fibromyalgia. My daughter has fibromyalgia and her consultant said her migraines and ibs are common with fibromyalgia suffers. Fibromyalgia is not very well understood and you need some one you can trust to listen to you. There is nothing as bad as too be suffering pain and have people think you are just looking for pain meds, you know your body better than anyone do not let them fob you off.
The best of luck