(Bump!) Lots of threads asking, “I feel it coming, what do I do?” Well here’s something.
Feel the urge? HALT. Ask yourself, Am I hungry, angry, lonely or tired? You can do something about those things. For the sake of sobriety, stop and take care of that first. They can easily bring on the humming sensation to pick up, and just as easily be fixed.
Hungry? Have a snack.
Angry? Step aside, cool off, reach out to another sober person.
Lonely? Hop on here or call friends/family. Maybe just ask how others are doing.
Tired? Sleep! Or at least acknowledge you’re tired, and resolve to let it go until you’ve rested.
We can be more raw than usual sober, especially in the early days. Listen to your body. Don’t throw everything away just cuz you missed lunch. 
It’s amazing how often this still works, even with a few sober days behind me.