You did mention that you have already tried an anticonvulsant, Topamax, but the other often prescribed anticonvulsant is Divalproex sodium/
sodium valproate. In fact, Divalproex
sodium/
sodium valproate has been shown more effective than Topamax in trials. So, you may want to talk to your doctor about Divalproex sodium/sodium valproate.
You may also want to try Botox Injections.
You may also want to talk to your doctor about Calcium Channel Blocker.