Are EMGs/Nerve Conduction Studies done for the face/neck? How can you definitely diagnose neuropathy/nerve damage in the face/neck? What tests exist, if any?

Apologies as I don’t have a TN diagnosis, but I would guess people here would be able to give good input regarding this matter. I also asked in the Bell’s palsy subreddit as well because it also deals with facial pain/neuropathy.

I’m years into facial neuropathy and neck stiffness on the left side of my face/neck and I’ve asked about an EMG/NCS for my face and/or neck, yet no neurologist has done that. I’ve only had it done on my left arm. Is there a reason they won’t test my face/neck for nerve damage, when my neuropathy is specifically there? Are there other tests that can diagnose how severe the nerve damage is in a person’s face?