Topamax and body aches

I have been on 100 mg of topamax twice a day now for over three years. Most of the early side effects have worn off like soda tasting bad and the memory loss. I never had any hair loss. Also the weight loss has stopped and I did gain it back which really stinks. Anyway, the reason I was looking, was that in the last several weeks, I have been suffering horrible body aches and joint pain. My hands and knees hurt very badly. I am 39 years old and hate to think that arthritis has set in so quickly. And I know that I can't have the flu with no other symptoms and so often. Does anyone else have these symptoms? Also I wonder why these could have started after so many years of taking it.I have tried to wean myself off in the past and the migrains came back full force.