Topamax
"LOVE LOVE LOVE this medicine!  I was apprehensive at first because of all the side effect horror stories, but at the end of my rope with around 15-17 bad migraines per month.  Sometimes I would have them 10 days in a row and my insurance would not pay for enough Imitrex, then I would run out and just suffer for days. Side effects were so bad the first week I almost quit:  dizzy, complete "weirdness", inability to handle more than one task at a time, anxiety, spacing out and forgetting things, etc.  And I still got migraines. It was a little scary.  On day 8 I took a leap of faith, increased my dose (as per the doctors orders) and the side effects all but went away, as did the migraines.  Life is better now."