Topamax can supress appetite, it had been a side effect for some people while taking it, for me, it did nothing in that area, so even my pdoc suggested I stop taking it and we went to something else. You may want to talk to your doc about this, maybe it is just a matter of time and dosage? Whatever, it is always to report any changes in yourself to the prescribing doctor.
Hope you 'll feel better soon

(((((((((( hugs ))))))))))))

In giving advice seek to help, not please your friend
SOLON