As someone with fibro, this makes sense. The brain receives signals and "decides" whether it is pain or not. Pain is a construct of the brain, a useful one, to keep us from danger, but I've always thought of fibro as the brain misinterpreting nerve signals as pain.

My own anecdotal experience would seem to confirm this. I don't suggest this for anyone, but MDMA is like a miracle drug for me. I can take one and feel practically pain free for weeks. I would guess it is due to the flood of chemicals "resetting" my brain, causing my brain to not misinterpret the signals, but that's a wild guess.