I try to have quick "good food" handy. Carrot sticks, fresh fruit (or frozen - especially in the summer I like frozen blueberries straight out of the freezer - YUM!). Preportioned snacks are good too - whatever your weakness is - just put a little bit in a baggie so you're not tempted to eat the whole thing. Another idea if that doesn't work for you is to just not keep the problem food in the house. I do this with potato chips. I love them and I'll eat the whole bag without thinking. So I just don't keep them in the house. I love ice cream too, but I'm ok with having single serving packages in the freezer - I can eat that and feel satisfied.
I hope that helps!

I totally know how you feel! I actually lost weight when I was pregnant, but then gained it all back and more after I had my boys! Nursing made me soooo hungry that I would reach for anything I could to eat and by the time I had time to eat I was usually way too hungry to make good food choices. The protein bars are a great idea and I also like to eat sugar snap peas. They're sweet and have a good crunch and they eventually will be almost as good as something you really want to eat! lol Good luck! And remember that teething doesn't last! My middle son got 8 teeth in a month! I didn't sleep for pretty much that whole month...then I found out I was pregnant with my youngest! I have to admit, I cried! I thought I was never going to get to sleep again! But it got way better! My oldest is 6, middle is 3, and youngest is 2...they mostly sleep through the night and no more teething! yay! Keep doing the best you can...and don't beat yourself up if you mess up. You're only human and raising little ones is a lot of work! You can do it!