4 D's -

DEEP BREATH
Breathe in deeply, hold it for 10 seconds, let it out slowly. Repeat.
It actually triggers a chemical reaction in the brain - the extra oxygen gets rid of the craving / adrenaline neurones floating about in between your neural synapses, and seratonin is released which eases your anxiety and cravings.

DISTRACT YOURSELF
Doesn't matter what it is, find something to keep yourself busy and take your mind off it. Something that'll occupy both your thoughts and your body is best.

DELAY IT
1 second, 1 minute, 5 minutes, 10 minutes, 1/2 hour...
Decide on a small period of time you're not going to binge for, and don't think about what you're going to do after that until the time is up. Repeat for as long as necessary, with whatever length of time works for you. The urge WILL pass!

DECATASTROPHISE
"Not binging won't kill me, but if I give in I may wish I WAS dead"
It's not that bad. You don't really need to eat, do you? In fact, it would be much better if you didn't. So don't.