My doctor told me that with topamax in the beginning you sometimes have to up it a few times, but eventually you get to a level where it's good for your body and you'll stop getting them and you won't have to increase anymore. It didn't work so well for me. I was up to 200mg a day and still getting them, but the fact that it helped you to begin with is promising because I never saw much of a result with just topamax, they added welbutrin to mine and it was much better.
Diagnosis-- Chronic Severe Migraine with daily headache usually caused by tension
Medications-- Daily: Topamax 100mg & Welbutrin 100mg
PRN: D.H.E. 45 Injection or Migranol, Phenergan, Ultram, Fioricet