There is a chance of a misdiagnosis here if Tegretol is not working. It is the gold standard for treating trigeminal neuralgia. If it is not working, it may possibly be pain of some other cause. The neurologist may be able to help you sort this out.
I'm not a doctor; had trigeminal neuralgia for six weeks and wasn't put on Tegretol -- the other things tried did very little and my neuro told me it was a shame no one tried it because had it worked, it was pretty much guaranteed to be TN.
I was given, with little success, lyrica and gabapentin.