welcome to pc! i'm glad you found us.
you didn't say how long you have been on topamax. most meds take about 21-28 days to kick in. perhaps that is why you haven't felt any change yet.
i'm bipolar. my hypomania exhibits itself in a most agitated state. at times before stability, very angry, too.
your feeling emotionally dead is what i call my "flat effect". it's usually when i am most depresssed. almost numb of feelings.
as for a dx i wouldn't want to say. do you have confidence in your doctor? is he a pdoc? you could discuss this dx with him next visit to better understand why the dx was added. it may give you better insight on why/how the diagnosis was made.
glad you're back in therapy. i find it helps me and i hope it will help you.