Hello, i have gone through your question and understand your concern. Facial pain is a debilitating type of pain, but it does not come from your facial nerve but from the trigeminal nerve. Anyway, you are already on full drug treatment. You might increase the tegretol dose but this might have some adverse. The next step in my opinion is injectingf glicerol in the trigeminal gangion, which is a minimally invasive treatment with good outcomes, but there is high probability of recurrence If this does not help I recommend a cerebral MRI to see if there is a neurovascular conflict of the trigeminal nerve after it leaves the brainstem. In case there is this situation you can do a microvascular decompression, which is very invasive but with a high percentuage of pain relief. Hope this answers some of your questions, please feel free for further questions