I don't do perfect (very well)

I am having a rough week. I know you don't feel sorry for me because I just came back from a two week vacation, and that's fine. We now have T-minus 3 days until the first open house. And my head might explode before then. The house cleaners made me rush home and miss the incoming Kindergarten playgroup that I am in charge of, because they couldn't open the lock box. They couldn't put in a three letter code and open it. So I came home, only to have them tell me that they didn't have time to clean my house this week. WHAT? I sort of lost it. I didn't yell. or anything, but I was very exasperated and asked why they wasted my time making me drive all the way home? So I called the realtor and she convinced them to do the kitchen and baths. When I asked them how much to pay, he replied "I don't care. I am only doing this so I won't tarnish my relationship with the realtor" At this point, my kids are trying to kill each other and I am standing in the driveway crying. So I put them in the car and head out to...nowhere. I had nowhere to go. I had the dog in the car and nowhere to go. And they are still fighting. So we head to the store. The kids only get worse, asking for everything in sight and alternating screaming at each other. Gracie decides she wants Sprite, and I said no. Which starts an hour long screaming/kicking session. Scott happens to call at this time and I am bawling. The kids have really been at each other lately, and I am not sure what to do. That, combined with the fact that the house needs to be perfect, all the time, is putting me on edge...This too, shall pass...