I would ask if the PNS would be an option for you. it is not invasive . it is not major surgery like the MVD or mototr cortex. it is not approved by the f.d.a. yet for treatment but it is used off market to help with a.d. atypical t.n. t.n. bi lat t.n. and many other neuralgias and illnesses besides t.n.
It is used as a last option after meds and other surgeries are no longer of help. it is 2 same day surgeries and there is a stickie at the top of the forums here with info and posts of ones who have or are going threw the implant surgery for PNS.
it is not an option that helps everyone but you are able to have a trail and it can be taken out at any time with out any damage to the nerve . Ask the new neuro and see if this would help in your situation.
here is a link to the stickie up top it is a LONG read but has helped others http://neurotalk.psychcentral.com/thread124048.html
sending healing low pain prayers and hope to you.
PEACE
Tina...BMW