Struggling to lose weight?

In the past 3yrs, I have had 2 babies. My tummy now looks like a ...it's great :) I do not mind exercising and do on occasion, like those hip hop abs, or the walk 5 miles with that lady...etc..but then I go and eat cereal, pop tarts, 4 pieces of toast with PB and J, ice cream, etc..I am a junky...and have NO WILLPOWER..I think of food all day long as I am a stay at home mom and its winter here....snow on the ground and freezing..so there goes any outdoor activities and I do not ski or anything..my kids are 3 and 2 so its tough as well...please help with any good cures on how to get rid of the stomach (its bad enough there are stretch marks :)