hi ny. i've had fibromyalgia for about 2 1/2 years and rsd for about 4 1/2 years and both illnessess cause me constant widespread pain. the difference for me is that the fibromyalgia causes me a deep aching pain where rsd causes me more of a deep burning pain. they both are pretty much widespread for me. some days are worse then others though. both pains are managed by pain meds that my pm dr prescribes to me. hope you can find some relief soon. soft hugs.