It happens, I understand. And I find that the more I think about not doing it the more I crave it! LOL But the trick is is to find a substitute for the hunger and/or sweet cravings. I recently started drinking diet hot chocolate. Only 25 calories a cup (a big cup!) and to make it a little creamier I will add a few tablespoons of sugarfree hazelnut creamer and a tiny pinch of cinnamon. I also add a little splenda if I am really needing it sweet. It coats my stomach and satisfies my need for sugar. Next thing I know my cravings are gone and I feel better for not giving in.
And I understand about the cereal thing. I mean, carbs AND sugar in one easy to make package. *sigh*
But just start fresh RIGHT NOW and bring your carb and calorie intake a little lower for the next few days to make up for it.
It'll be ok!