Topamax and nervous breakdown

My Rheumatologist put me on Topamax for my Fibromyalgia.
I didn't notice it was helping any better that the med I was previously on, however, kept on taking it as the dr thought it would be better. I went on Topamax right after Thanksgiving. Christmas was hectic and I began to feel like I was going crazy. I couldn't remember people's names, what I was doing, names of objects, etc. I was always so tired and nervous, I went to the doctor to see what was wrong, was I having a nervous breakdown? going mentally ill? She quickly told me it was a common side effect of the dosage of Topamax I was on! At least now I have an answer and will taper off of it this week with the dr's help. How scary!