trigeminal neuralgia
"Had post herpectic trigeminal neuralgia (one of the worst cases in history according to my doctors). Began treatment with medications available in 1995, which almost destroyed my endocrine system.  I tried Neurontin when it came out and today find I can control what used to be chronic burning pain down the side of my face from my scalp to my upper teeth across my right eye with 600 mg of Neurontin taken before bed."