I had the same problem with Neurontin/Gabapentin, but after a few weeks I actually adapted. I combined a small dose of nortryptline with the 2400 mg of gabapentin and it has been very helpful. I do get a bit of a mouth dryness with nortryptiline so I try to take in extra fluids.

I feel like I've read some literature on effectiveness combining drugs (particularly nortryptline and gabapentin) at low levels instead of taking just one drug at a higher level. Perhaps someone can chime in...