I just found a survey that suggests that exercise is actually more commonly a negative thing for fibromyalgia. -_- There are also articles talking about exercise causing "flares." I think I give up researching. I give up trying to collect general treatment strategies. Not because the research disagrees with me, but because it disagrees with itself... I've seen at least as many sources that say exercise is a must.
All I can do is experiment. Heat seems to be beneficial, so I got an electric blanket, and I feel like I'm waking up more refreshed now. While it's hard to start, dancing leaves me feeling no pain (except perhaps normal burn from working certain muscles). These kinds of things seem more useful for me than looking at what has or hasn't worked for other people. Still worth looking for ideas, but not for effectiveness.