I typically get them at the end of my period, usually for 2-3 days. I started taking Relpax (Imitrex didn't work quite as well) at the onset of them. The Relpax worked pretty well, but it's expensive and makes me very sleepy. Two years ago, my OB/GYN switched me to a 24 day BCP called Loestrin. The thought was that the headaches would happen less frequency if we kept my hormone levels steady for as long as possible. That worked pretty well--and I virtually stopped getting them for about a year. After that, however, I've started to get them again. They're not as frequent or as severe, however. I can sometimes get away with just Excedrin, but still keep the Relpax handy just in case.