I have years of experience with Neurontin (Gabapentin), although I don't take it currently. I took it for years for migraine prevention, usually along with other anti-seizure medications like Topamax and Zonagran...as Neurontin isn't usually prescribed alone (but I did notice a difference with it). Drugs in this family aren't addictive like benzos are - your body doesn't become physically dependent on them, although I suppose if you're symptoms are being treated successfully, they would return if stopped.
The main side effects I noticed were tingling of my fingers, usually just in the morning, and nothing too bothersome...and dizziness and/or clumsiness, also usually just in the morning (sometimes severe, to the point where I would need to hold onto things to walk, but only lasting a few minutes and never accompanied by any nausea). The dizziness went away after being on it for a while. Neurontin is also sometimes used as a sleep aid and does help a lot of people sleep. It can also cause quite a bit of weight gain.
Lyrica is a fairly new sister-drug to Neurontin, almost identical in make-up, but probably 100 times more expensive because it's brand-name. Some people have more luck with it for nerve pain - I tried it and didn't.
Different doses are given for different ailments - it's a very widely used drug. I used to take 600 mg. twice a day. I actually stopped taking it because I started having a lot of pressure in my eyes, and Glaucoma is an extremely rare side-effect - although I tested negative over and over, I wanted to be better safe than sorry!
Good luck - I hope you give it a shot and it helps!!