Years ago my friend's mother had facial pain, so he took her to ten different doctors, UVA Medical Center, acupuncture, everything. It was determined she had tic douloureux.
She said "I can hold a glass of water to my face and pain is so great I can't stand it."
Finally my friend took her to see my grandfather, a physician (D.O.) and he said he had known her for years, she made mistakes and this was psychosomatic. "Get over it! Let the past go" he told her.
The pain went away.
This is from Web MD: "The cause of tic douloureux is unknown."
My Dad had cancer at 34, went to Sloan Kettering in NYC. The surgeon said he could tell who would survive the minute they walked in the door. "You'll survive" he said. Dad passed a few years ago at 88.