Fascinating! I have FM and find that I have flares when there is a barometric change, emotional stress (a killer), and cold. I keep a sweater in the car so I can go in the cold sections of the grocery store. I've read that FM is usually preceded by a sleep disorder. I have restless leg syndrome, and finally had a sleep study done. If you do not get enough REM sleep, your body does not secrete the hormone that mends the wears & tears in you muscles.
There are days that I just can't go or do.