Hi there. The causes for pain in face are an abscess in tooth, cluster headache,
herpes zoster or simplex, facial injury, migraine, myofascial pain syndrome, sinusitis but has been ruled out by endoscopy, tic douloureux, or tempero mandibular joint dysfunction syndrome etc. You can consider these options with your neurologist, though trigeminal neuralgia is a fair possibility. treatment would include painkillers, tricyclic anti depressants etc. Hope this helps. Take care.