Dear k-k, I would hope that the anxiety is a passing thing, although Topomax has been known to cause it. Topomax worked amazingly well for me, but my side effect was respiratory and I had to stop. I still think about giving it another go; it is the only med, in all these years, that actually worked.
Work with your Dr. to see what can be done. When did you start taking it, when is your next appointment? You may want to call and check in with them; let them know what is going on for you.