I have been on Gabapentin for over a year now, other than sometimes feeling tired or a little "uplifted" (I guess you can experience some euphoria sometimes)... I actually do not experience a headache with Gabapentin. In fact, it has actually helped with the chronic migraines I have. Right now, I've got something going on with TN or Bells Palsy or something and I have severe pain... but it's pain that goes from my throat up to my temples and I do have a headache, but I'm also on a ton of medicines. So I'm thinking it is from the pain or from the meds. :(