I think you are over worring yourself for nothing. You will be just fine. I know that it is hard to allow yourself to believe this, but even after you cheat (which you did not do) you will still fit in your pants the next day. You will not be all of a sudden put on the weight you took off. There is no need for reinduction. And it is good to know that once in a while you can give in to some impulsese and be ok.

For the record, I eat l/c icecream a lot, well usually once a day.