First, my kids are older than you. I've done this lots of times. Learned a lot.
Quit beating yourself over the head with the tater chip sack. It's pointless.
So you went on a bender. So what.
Learn from your mistakes, and crawl right back on plan. But make sure your plan is reasonable and something you can live with the rest of your life!
Personally, Weight Watchers works for me. I love the meetings, I need the accountability of filling out my tracker, and I really like that no food or drink is off limits, as long as you can work it in. Plus the support, and hints, and making friends in the same boat.
I'm within 4 pounds of my goal, I sorta took the weekend off of WW. I didn't go crazy, but I enjoyed the family/friend get togethers. Kept portions in check, but had a few beers and some fun too!
I have to weigh in tomorrow night, not going to be pretty, mostly due to a lot of salty food. But that's ok. I'm crawling right back on plan in the morning, and I'll lose those last four pounds.
None of us are perfect, myself included. It doesn't matter how may times you fall down, what matters is how many times you get up!