Have a little faith in the VA, any hospital or dr could have prescribed you this. it's possible your dr might have saw something to make him think you could be having seizures, or maybe gabapentin is used for more than one ailment (after all viagra is prescribed for babies with heart problems, since an erection is actually a side effect). so talk to your dr. there are some adjustments that obviously need to be made, ask him why he put you on this med. and if it's that bad, why are you still taking it? dr's orders are best but you know your body and if you are sure it is that specifically hurting you, then you know not to take it!
my dad is a 100% disabled vietnam vet. i've grown up living with and learning the VA system and know the difficulties and animosity that can build, but you do need to realize they are great hospitals, and mistakes can happen at any hospital!