A while back I took Gabapentin for a few years, then discontinued it which was no fun (you need to withdraw very slowly).

When I started having twitching & cramping, I agreed to go back on, and it controlled those symptoms well.

All of that was before I started to develop significant nerve pain, so I don't really know if it's currently doing anything for me as far as the nerve pain.

Side effects for me are sedation (which may be a good thing for you if your having trouble sleeping), memory problems (particularly searching for a word or name you want to say but can't remember it), weight gain, and some loss of libido.