Gabapentin
"Side effect of cluster headaches. Gets worse if I don't stick to every 8 hrs dosage.  I'm frustrated because one neurologist and my pop are treating me for nerve damage, but another neurologist says my pain is muscular.  He can't explain why I have tingling in my arms and legs.  I was considering tapering off the gabapentin 3x 300 mg) based on the 2nd neorolgist, but the pain is unbearable."