I recently tried this med. Had the same side effects and after a couple of weeks could not sleep at all. It was a terrible experience. I felt kind of hyper. I also am very sensitive to medications. SSRI's are not generally the first line for migraine treatment, but I'm guessing you have been through a lot of different medications already. Have you tried Lyrica? I had major success with this in a very short time. The only thing that I noticed is that I can only take it for ~5 days on and a couple of days off because of the med makes me irritated. I think I am just always tired on it, so I feel kind of grumpy, but for 3, 4 days you will have a minimal headache if it works for you. Also, you may not have the side effects that I have experienced. What type of abortives do you take?
List the other prophylactics you have tried and I can provide further ideas. Another med I am going to try is Clonidine. Sounds like it could work.
Hope this helps.