Thank you for your question. Trigeminal neuralgia may have a triggering factor like recent history of tooth extraction, touch, cold breeze or hot sensation etc which you need to evaluate and avoid, , but hardly varies with age. Drug of choice for trigeminal neuralgia is carbamazepine but as the dose may vary according to severity therefore I would advise an oral medicine specialist consultation or at least a physician to confirm this diagnosis and get you treated accordingly. Take care.
Have you consulted your Dr.? Sometimes a single drug is not as effective as 2 or 3 combo of drugs, but only the Dr. can recommend which to try.
I haven't try that myself, I'm lucky in the sense that Neurontin (gabapentin) still works magic for me, but I know several people who can only cope with more than 1 med at a time.
Hope your pain ease up real soon,
You may want to try some of the other drugs that are used to treat TN. Maybe you have developed a tolerance to Tegretol?