I'm so sorry that your mom has to endure this monster. Glad they didnt drag her to 2 - 3 specialists before they diagnosed TN. The only meds I have taken is the tegretol, so I don't know anything about the drug your mom was prescribed, but I am sure someone on here could tell you about it.
My heating pad helps my pain better than anything else.

I'll be sending positive thoughts and prayers her way.

Rhonda