I just looked into TN and omg, never realized it. Found a couple links that you may have read:
Alternative and Complementary Treatment Options for Trigeminal Neuralgia | PainScale
Woman who had surgery
Facing the Pain: Monroe Woman Finally Finds Relief from Trigeminal Neuralgia - CentraState Healthcare System
I have been using homeopathic remedies for years and some work good for me and others not. OP, have you looked into homeopathy for TN? I find Topricin homeopathic lotion for pain a lifesaver in my life, but I am not challenged with TN. But thinking out loud.
Homeopathic Remedies For Trigeminal Neuralgia Treatment and Cure
Even going with a homeopathic doctor for their opinions and support.
Just a though as I'm always trying to "figure" out ways to get improvement.