The nutty thing about cravings is that the cave man in your brain is telling you that it'll be dire and dangerous if you don't give in and drink.
The cravings come from the part of your brain that regulates the most basic elements of survival. Like not falling from a high place or the urge to swim to safety if you're carried out by an ocean current. The need for alcohol gets mixed in with basic survival needs; so the urge to drink is mindless and not easily overcome by your rational mind.
But the more you do it and then feel fine, the easier it gets. So try to focus on the accomplishment of not drinking and remember not to let the cravings overwhelm your conscious mind.