I had been taking Topomax for a few years and then I was getting daily or every other day migraines. I also started to notice my memory change ( passwords were hard to remember, I could not remember a unfamiliar phone number if I saw it once, I couldn't go to my phone and put it in..etc.) So I decided to reduce the dose and things were still really bad, so I increased all my supplements (B2, feverfew). I got worse so I decided to stop everything except magnesium and I reduced it to 750mg from 1000 a day.
Guess what? migraine are minor now. Not daily and when I get them they are small. My memory is so much clearer and better. I cannot say for sure, but I believe it was the topomax. I feel %100 better off, have more energy and now I am hoping to control them with OTC, Pepsi and imitrix.
I know it might be hard at first, but you mighy try going off the preventitive and see what happens.
It has changed my life..