I am in my 50s so I wasn't sure if it was menopause, FMS, or both. I have run a low grade fever for 24 years now. That has to be FMS/CFS. No DRs could find anything wrong with me. I also noticed that I would sweat profusely on my head!!! Mom always said it was because of my hair (thin, baby fine???). I always found that to be a very weird thing. My hair would just get soaked at times.