I'm up to 50mg per day now, and plan to increase the dosage another notch soon, maybe this weekend. It does seem that the Topamax is decreasing the frequency of my headaches. I wish I had kept a strict log, but I've never been one to do that. It would be far too much hassle -- especially considering how often I was getting them.
The side effects seem to have dropped off a bit. I think that was due to some kind of tolerance or adaptation effect. Some people talk about it as if increasing the dose in gets rid of the side effects, but I think I dispelled that myth by staying at 25 mg. for far longer than I was supposed to. Some minor side effects came and went with no change in dosage.
Anyway... I'll post more when I increase the dosage again.