I too have almost constant sweating and chills, but it does seem to be mostly when I'm ill. I'm currently phasing off Cymbalta to switch to Savella. I now know that the Cymbalta was definitely working cause I'm really flared up. Not just with FB pain but the pain caused my bio-mechanical and arthritis too. I'm hoping the Savella will tone down or eliminate the 10 days or so per month where I am in too much pain to function. I've tried flexerall and other muscle relaxants but they just put me to sleep during the day. Lyrica doesn't do much for my pain but it does help with tingling, though "tingling" is really insufficient to describe the electrical sensations I get when not medicated.