I am not sure if it is still used but my father had this and was given carbamazepine under the trade name Tegretol. It worked very well but did cause slight nausea on occasion. What’s the cause of the trigrminal pain? In my father it was the degradation of the myelin protective sheath around the nerve (he has Multiple Sclerosis) and was the typical form of sudden sharp shock like pain. Yours sounds more like the ATYPICAL version in that it’s chronic rather than acute.
Any chronic symptoms can “wear you down” so be aware of your mental health also as it can lead to depression on occasion. Medication is available as I said above but also surgery is an option. It is possible to cut a section of the nerve which can lead to instant relief but can also leave you with a numb face and sagging (similar to stroke after effects).
I assume you have seen a doctor and been referred to a neurologist already. If not go do it. Good luck and let us know how you get on.