postherpetic neuralgia
"Does not make me dizzy or overly tired. Most doctors don't know how to dose it or prescribe it. A lot of doctors don't know much about shingles either. They know it is for pain so they treat it like a narcotic. It is not habit forming and not a controlled substance. It does take 2 or three days to start working though.  I was misdiagnosed at the ER after I told them I thought it was shingles. They said I had facial cellulitis and put me on the wrong meds for two days, during which I suffered through the peak of the attack.  "