I take Neurontin for nerve pain and seizures.
Like the others have said, give it a little more time. I am extremely med sensitive so I can really empathize what your going through. I am not sure how fast you titrated onto it or what your current dosage is; but I ended up titrating onto it really slow. My neuro and I pretty much handle titrations based on how I am doing-- my "orginal" titration plan to get up to 900 mg was supposed to take about a week total; ended up taking over 3 weeks. There were times when I didn't think I could handle all the side effects, zombiness and thought about- (and my neuro even ecouraged I do so at one point)-- quitting it, both during the titration period and shortly after the titration; but I really wanted to give it a good shot at working, seeing if it would help and I just decided try to push through it a little longer. I am pleasently suprised and happy I did. I still have some side effects that are really frustrating, but I feel at this point it is worth it.
I was put on it orginally for my nerve pain with no real expectations or hopes seizure wise; but ironically, it has helped the seizures more than the pain-- and thats perfectly fine for me ! A little extra help in the epilepsy aspect never hurts

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L2L