I'm new to this yet and just can't figure this out. I've been very sensitive to heat and humidity for years, but I also have more pain in my joints on cold or stormy days. Is this common with FMS or CFS? Is there really any difference between the two? My doctor gave me an "unsure" diagnosis or FMS, but from what I've been reading, heat doesn't affect FMS. Does anyone else have this problem? Also, are MAJOR fatigue,sleep problems,ringing in the ears and overall pain common in both?