I'm on Day 19. For the first week, I was acutely aware every evening that I couldn't have a drink, which made me miserable. That seems to have passed, which is great.
But its been replaced with those "sudden entry" thoughts of "ooo, a beer would nice! Oh. Bugger. you don't do that any more".
In my very short experience I'd say there seems to be two themes I'm dealing with at the moment - these "sudden entry" moments and and emptiness/boredom/analysing my life part (this bit is quite hazy so far). I'm hazarding a guess that the sudden entry parts will subside quite quickly but the other stuff is why I started drinking in the first place and thus where the real work is.