I always get the munchies the week before TOM. I try to acknowledge it for what it is -- that helps me feel less out of control.
I also change up my menu a little. Usually I eat three major meals and have maybe one snack between lunch and dinner. During that week I made my meals more "modular" and eat more frequently throughout the day.
The other things I do during that week are make sure to keep myself busy so I'm not just sitting there watching TV and thinking about food, and I make sure to keep up with my exercise. This keeps me active, keeps me from feeling bad about myself if I DO have an extra snack or too, and seems to help with cramping and all those fun feelings