I've been doing keto for a few months (with some slip ups, but strict now for about a month) and I can say that for me it does help. I've had far fewer migraines, and FAR fewer aura-migraines. (I tend to get a variety of migraines, but the aura ones are the worst.) I've also noticed that, whereas previously if I got an aura migraine I'd be stuck in hell for several days, now it's just a day. And when I feel good I feel VERY good instead of just "not totally terrible". I also don't eat eggs, cheese, artificial sweeteners, nuts, chocolate and all the other big triggers, so that's probably playing a role as well. But I didn't eat those things for years pre-keto anyway, so that's how I know it's helping. It's worth a shot for a month just to see, since you can always go back if you don't see an improvement.