Good, maybe that's a sign that gabapentin will be easier to withdraw from than benzos.
I am not nuts, I assure you...and I don't think that technically I was ever psychotic.
It's the gaba system...drugs that act on gaba are incredibly hard to withdraw from. The reason you are hearing sirens is that a normal person has plenty of gaba to protect them from sounds they heard 3 days ago. You don't...so you will hear everything over and over, without any protections. I used to hear the train all the time, commercials on TV over and over, all of it together. You'll hear you heartbeat, your stomach digesting and it can sound like a washing machine in your gut. Tinnitus is a common side effect. A small gas bubble in your stomach can feel like a knife. Light and sounds will annoy the crap out of you. Social withdraw is not uncommon. All of your senses are affected by gaba and they are generally heightened when you withdraw just like when someone takes a hallucinogenic. When I unexpectedly withdrew from a benzo, it got so bad that all food smelled and tested like chemicals. When smell and taste are altered, things are getting bad.
Unfortunately there is very little help out there for this sort of withdraw as it is not something that can be done super fast, as your brain needs time to adapt. IMO, you have to come up with a tapering program that you can do yourself. As I recall though gabapentin is a capsule, not a pill. You'll have to get your Dr. to give you a smaller capsule so that you can start to taper it slowly. I am not sure about how dangerous it is to withdraw cold turkey. With a benzo, it is dangerous...one can do damage if the withdraw is severe enough. Heart Attack is a side effect.
There is almost no information out there for withdrawing from gabapentin, but there is a ton of info on withdrawing from benzos. I would direct you to the wikipedia article on benzo withdraw syndrome. It is very detailed and well written. One citation is a guide to withdrawing with schedules for tapering written by a Dr, C Heather Ashton. She is a Neuro-Psychiatrist in England. She ran a clinic in the 80's for benzo withdraw and is considered the subject matter expert in the World. Her work is awesome and saved my life. You can do this yourself, with the right motivation and tools. A good Dr. that will give you smaller dose pills so you can systematically taper is ideal...meaning if you take 100mg, ask your Dr. for 10 - 10mg pills so you can take 9 for a couple days and then 8 etc..
One warning. If you go to a Dr. DO NOT let them talk you into taking valium or ativan to help you though it. If you are having a seizure, fine take the ativan, but the only way through this is to get through the symptoms while tapering so that your brain can naturally rebuild the receptors that were destroyed by taking the drug. You will recover.