My Children are Killing My Diet

Right now they are grating on my nerves like fingernails on a chalkboard.....Don't get me wrong, I love them dearly, but I need a break. I haven't had a real break in....I don't even remember when. My son has not had a nap and refuses to take one, yet he is listening to me about like a deaf-mute and getting into and destroying everything. And my daughter and my son are both whining and hollering and fussing over and about everything! I have a massive headache. I tried to give myself a five minute time out (more than that and they would destroy the whole house!), but that definitely did not work, especially since I could still hear them bickering and whining. I have ADD, for real, so I cannot concentrate and can't get anything done around here. I told my fiance that I wanted to go to Sweet Tomatoes to eat dinner, but I think I will nix that idea. I can't go with a toddler who hasn't slept and a four year old in a bad mood. I think I would run out of the restaurant and just keep running. Gimped up foot or not. So I caved. I went back to my tried and trusted way of dealing with stress...I ate. I ate foods I shouldn't be eating. And they tasted so good and I felt better for about five minutes, which was more relief than I had from anything else. I had a small bag of Doritos and an oatmeal cookie. I know...terrible for my diet. I totally killed my whole day of dieting for five minutes of relief. But I am still debating on whether it was worth it or not. I am that frustrated/annoyed/stressed. I just do not have anything that relieves my stress to any degree other than eating. It's pathetic...sad even. My fiance says, "Get a hobby." But I don't know what I want to do. I lose interest in things so quickly. Plus I feel like it would cause more stress because the kids would keep me from doing my hobby, or my son would destroy whatever I was working on. I need to make school my hobby (I'm getting behind) but it's so hard to concentrate with the kids yelling and me constantly getting on them about things. I know my life isn't that hard, especially compared to others' lives, so why does it feel so incredibly impossible most of the time? I just don't understand.