The drugs you were given are fairly common. I was put on Naltrexone by an addiction specialist. Gabapentin is also pretty common, it's used for anxiety and a lot of people are given it to help calm the anxious feelings caused by alcohol withdrawal. I stopped taking Naltrexone and switched to Campral because I thought the Nal had too many side effects. Gabapentin does not have that many side effects for me but Naltrexone was terrible. Unfortunately it is likely if you go to an addiction specialist they will just recommend the same exact things you're on. The only other thing they will tell you is to go to AA meetings. Anyway if you don't feel like you need the medication and the help, why did you go to a doctor in the first place?
Did you talk to your doctor about the side effects? Maybe you need a lower dose?