I have been dx'd with ATN. It started after dental work.
I always have discomfort, but previous to my treatment and meds...I was in constant pain and sometimes horrendous, over the top pain...much like what others have said. I still have some bad days and have to take Percocet..but am doing much better overall.

My treatment is this:
I take Despipramine daily. It is a tablet, much like Elavil.
I have a compounded cream that is made up of Gabapentin, Lidocaine and Capsaicin. I put this on the affected side of my face four times a day.
I also go to acupuncture two to three times a week.
I take Percocet for breakthrough pain, but do not have to take it as often as before.

Still very difficult, but not as terrifying as it was originally. It has been horribly frightening and challenging. Life altering. My medication, etc. has helped. It is noticeably better now.

It is something to talk with your doctor about because I have heard from others with ATN that this routine has helped many, although some people take the Gabapentin orally.

There are also neuro stimulators that can be implanted into the face...something I have considered and hope I won't need to do.

Wishing you well.