I've had serotonin syndrome before. To me, it doesn't sound like what you have. When I had it, I was certain I was dying. The world was foggy looking. Breathing was a chore. My skin felt like fire and ice at the same time. It felt like my heart wasn't beating but then it would start again. It was awful. It wouldn't hurt to call your doctor but I think your symptoms would be much more intense than just sweating.
Good luck.
Yea, you'd need to be taking waaaay more than 20mg of Prozac. Xanax is in a completely different category of drugs, so it would have no effect on Seratonin.
It's very unlikely, it's a pretty serious thing and you'd know it. Sweating is a common side effect of ssris.
check it out on the web, there is a list of symptoms. I hope you are okay.