So it might technically be off-label use, meh, so what? Antidepressants are used to treat pain and help people stop smoking too. If an anti-convulsant/bipolar med relieves the unwanted symptoms, more power to you and your smart doc!

I'm of the belief that if you want a medication to work and believe it will help, you're one step ahead of the game than if you were pessimistic and expected it not to do anything.