There is a version of TN that is caused by shingles -- called post-herpetic trigeminal neuralgia. It could also be "classic" TN or another type of facial pain.
Sometimes it takes a while to find the right doctor with experience in facial pain. I went through 5 different doctors before I found #6 -- a Facial Pain specialist - that was able to help me. You can find a Facial Pain specialist at a large teaching hospital. These docs deal with facial pain and headaches on a daily basis and have great expertise.
If you haven't already, you may also want to post your question on other communities -- for migraines, neurology, headaches etc -- to get feedback from those communities as well.
It sounds like trigeminal neuralgia. Is that what they are calling it? That is just awful. Do a search on here for trigeminal neuralgia. Maybe somebody has written about how they got the nerve to calm down. Hope so.