postherpetic neuralgia
"I suffered with trigeminal neuralgia for over a year before I was diagnosed. They call it "the suicide disease" for a good reason. Such awful pain on the left side of my face, like someone had taken a club and hit me on the side of my head. At times it also felt like a hot poker was lying on my teeth. All I could do was go in a dark, quiet room. Sometimes sound would set it off, but usually it would just happen all by itself. I had tooth fillings taken out, dental X-rays done, trying to find the cause. It's a rare disease. The doctor gave me 600mg Horizant ER samples and I took (1) a day after dinner at 4. It worked! Then they tried to fill my prescription with generic Gabapentin at the pharmacy. No good! Didn't work! Back on Horizant. :)"