Q-Tip Revisited

I've written before about Q-Tip - quite taking it personally. It's SO hard!! I'm human with feelings and emotions, and my skin is not as thick as leathery elephant skin! Every morning I endure being called the B word by my 6 year old son if I don't give in to him on something, anything. My 10 year old talks like a bitter nasty old hag to me and has no regard for anything I say to her. My 13 year old thinks she should run our house and if I won't let her she "gets back at me" in very passive aggressive ways - not flushing the toilet after going number 2, pointing the shower head at the shower curtain so the next person to turn on the shower gets sprayed, along with the entire bathroom, putting dirty dishes back in the cupboards etc. My 4-almost-5 year old will pull down his pants and pee on the kitchen floor. My 7 and 8 year olds go in the closet and pull all the clothes off the hangers and brake said hangers, then pull all the clothes out of the drawers and leave the drawers hanging out...all clothes left in piles all over the floor. Food keeps disappearing from our pantry and refrigerator. I've had to screw 3-inch industrial screws in the hinges on the boys' bedroom door to keep the door on because they've torn it off 3 different times, and now even those 3-inch screws are losing the battle. Someone keeps digging bigger holes in the bathroom wall where the TP holder used to be before they tore it off. Anybody wonder why I lost the battle to quit smoking? I know some of this is normal behavior, but in my house this behavior is constant as long as their eyes are open during the day and night. The ONLY time someone isn't doing something to raise my blood pressure is when everyone is asleep. And I can't even enjoy that so much because by then I'm exhausted and asleep too.
I chose this life and these kids, and I love them. But today my nerves are worn thin and I'm taking everything personally. My doctor called, there was something wrong with my blood work and I'm being referred to an internal med doc. I needed to vent a little, so thanks for listening.
Kelly