Welcome to HealingWell and to the bipolar board.
I'm on topomax and haven't experienced anything like what you're having (thankfully.) But everyone's different, of course. Topomax is supposed to double as a migraine drug, though, as you mentioned, and if you're having terrible headaches, I'd definitely mention that to your doc. Poor thing. Don't let it go on too long. Troubled sleep can make bipolar much worse.
Co-Moderator, Bipolar Forum