The best tip I can give you is to FORGET you stumbled and keep right on going! We ALL stumble!
Two things I have found to be true. First: when I eat the way I am supposed to (proper portion, nutrients, schedule) I am LESS likely to be tempted. Second: Exercise has to be a form you enjoy! If you are fond of dancing this can be an excellent cardio workout (i.e. zumba DVD). Strength training videos available on this site are really good and take very little time out of your busy day!
Just stay connected to the people who support your goals & you can do what you desire! Believe in YOU!