This is the first time I have read anywhere of a connection between fibromalgia and RSD.
Normally RSd leads to osteoporosis. Migrane and clusters headaches are one of the many secondary symptoms. RSD spreads in 77% of use and there is no commonality in the way it spreads or timeline. My first spread was caused by the use of a sensitivity pin 4ins outside what was thought to be the affected area causing it to go from hand upto elbow. Something the specialist had not seen before in 20 years of treating RSD sufferers meaning I am ultra-hypersensitive. The second by my grandson who when I started to walk trod on my toes with his boots oon so I now have it in both legs.
In 10% of use it will go full body, all 4 limbs, neck, head, eyes, teeth and internal organs.
I am also on of the 7-8% whose wounds may never heal.