I had trigeminal neuralgia when I was 77 (now82) for two years on the right side of my face from my ear to the center of my jaw; Worst pain anyone can imagine. It drove me crazy. Had a novacaine injection from a pain doctor--the pain got way worse. Finally, I had a back molar removed, then I had another one removed (root canal tooth), THEN, slowly the real pain went away. Now I just have a slight sensation along the jawline. The only relief during that time were cannabis gummy bears my son had gotten in Colorado. I cut the bear into 10 pieces--10 mg at a time to help me sleep. Have compassion for your poor father.