The thing with smacking and the behaviour that chigley describes, is that you try to tell them, cajole them, whatever, into what you are trying to do and then when they don't/won't do it, you get frustrated, especially if it is constantly happening, and I challenge anyone to say that they haven't lost it with their kids at some point.
Chigley for what its worth, I've been there, done it and got the t shirt.
Lets face it, kids can be the most selfish, demanding, annoying, frustrating people on the earth. Adults don't behave like kids do normally, and if they did then you wouldn't bother with them, would you?
I can't stand this self-righteous attitude about smacking, I try not to smack mine, but have done, very occasionally, and I resent people or the government trying to tell me what I can and can't do. They aren't here 24/7 trying to deal with the situation.
Anyway, there are different ways or dealing with it, but it does sound like you need a break, or some time to yourself, or to reduce the stress involved.
Can you post what the problem is with your children, is it fighting, bickering??
Sometimes when mine are winding me up big time I have found that I can diffuse things, by distraction, ie saying something silly to stop them doing whatever it is that is causing the problem.
Let us know what the worst thing is?