Hey Jon. We've got similar history, similar volume and length of time. Everyone's different and the problem is different for everyone. What is not much for one person is way too much for another. The thing we share is this evil addiction to a n evil substance.
You may want to go to the GP and get some tests done. It'll either be great news or a proper shock to the system. Either way you'll know what you're facing. It's up to you if you admit to them how much you drink but if you do they may advise that you phase out the drinking so that you don't shock your body too much if you went cold turkey. But FWIW I agree with Dee... I tried cutting back and moderating for years... It just didn't work, I'm an all or nothing person... So right now I'm nothing.
Anyway, good luck and keep going.