I haven't been on the message board for awhile. I just started having a new problem and decided check it out. I found some from last month about this problem, but does anyone know if it's a fibromyalgia thing? I sweat then I get cold. Sometimes I'm hot and cold at the same time. I just quit my estrogen but have been taking black cohosh. It helped last time. I'm also on thyroid medication. I could understand the hot flashes if it was the estrogen, but cold flashes? I also read about the herpes virus 6. I have had cold sores, is that the same thing? This is driving me (and my husband) crazy.