When I first started, I used to get dreadful cravings right out of the blue. So I turned to my trusty Atkins book (Dr Atkins New Diet Revolution) to see if he had anything to say about cravings, and of course he did.
For prevention of cravings, he suggests L-Glutamine, and so do I! For me it was a life saver! One to two tablets half an hour before meals and you'll be feeling more like your self/ves.
But for instant treatment, eating something high in protein and fat can curb those cravings like magic. Try a piece of cheese or some tuna with lots of mayo, or something along those lines.

Just do not give in, or you'll be right back where you started. Feeding cravings is like feeding a monster. (Been there, done that. )