I'm new here, but I got relief from Neurontin within a week. The first four or five days on it were hell, because I was dizzy and nauseated all the time, but I seem to have gotten past that now, even to the point where I can quit using my methadone again. (I have been on that for years as needed for cervical pain.)
As far as narcotics, if you need them, I can recommend the methadone. When I need it, I am on 10 mg BID. Don't notice any side effects - and being able to take it only twice daily is a benefit to me.
Pain is down to around 2 - and that's mostly "buzzing" in the feet.
Good luck to you.