So I started Topamax a couple weeks ago, and I've been having these cramps too! I went to the dr, and she thought I was crazy. She did address the sinus infection though. The only thing now is that I have no voice and I still keep having the cramps. I even specifically told her that I had just started taking Topamax, and I was wondering if I was having some weird reaction to it, but she just dismissed that whole notion....grrrrr....It's not like I didn't provide her with detailed notes and a list of symptoms and medications I take, along with some other vital health history....(Yes, I keep a notebook, b/c I can't remember anything).