Welcome to the site, tursiops999 .
That "voice" is just like a memory or a trigger. It's the voice of your addiction trying to get a stronghold again. I think everyone who quits drinking has that voice to an extent. It's just a thought. The longer I go without a drink, the better I've gotten at recognizing it and letting it go. I just say, "Hm, there it is again. I don't drink."
If you had problems with alcohol that were serious enough to go to AA, then I'd think that regardless of whether you have doubts or not, not drinking is definitely a good call.
There is a recovery program called AVRT (Addictive Voice Recognition Program) that talks a lot about this, and has a different slant than AA. Google Rational Recovery for more info.
You'll be okay. Just because you think something, doesn't mean you're going to act on it.
Do you do any meditation? Meditation is good for that.