I never had CRPS, but I did move from fibromyalgia into CFS over about a 2-year period. The initial aches and pains of fibro were manageable for me in a work environment, but when the CFS hit, I was down for the count. (I lost my job mainly due to exhaustion, immune problems and brain fog.) Now, some 10 years after the fibro diagnosis, my pain moves around -- might be exquisitely tender right elbow for a few days to a few years, strange knee pain that comes and goes, low back pain that feels like spasms and responds fairly well to bed rest and a heating pad, etc. I never know when any particular pain will come or go. I don't know if I've improved over the years or if I've just gotten used to being disabled, but I don't seem to pay as much attention to being out of whack. Resting and Lyrica are the most helpful treatments for my fibro pain.