Hi Bob,
I had what I was told was Trigeminal Neuralgia. I would get pain in and around my ear, jaw, etc. and was sent to a dental specialist. Checked for TMJ, etc., no jaw/dental problems, therefore it was TN.
When I researched TN I found that my pain was different than what was described for either typical or atypical neuralgia, since my pain could often be constant lasting up to a week or more.
Despite all my docs (PCP, Neuro, Dentist) no one really pointed to any one cause. I have therefore come to my own conclusion: Not that it will make you feel better, but maybe demonstrate that whatever is going on with you is causing your Trigeminal Nerve pain.
In my case my MS has focused on my Trigeminal nerve, just as it might cause ON, or tremors, or swallowing problems, it causes pain all over my TN. (which is a nerve with many branches running through the face, eyes, ears, neck.) I now take lyrica and it is 90% better.
Good luck with the testing, hope you get relief from pain and numbness soon!