KSM,
It does make one so very tired. Our Difficult Child stomped out one day, saying "I'm not taking this bull s*** anymore!" Even though, his dad and I were weary and stressed, we were sad when he moved out. He was a junior in high school. Within 6 weeks, his friend's family had kicked him out and he moved back in. Things were worse than ever. He always wanted to tell us how things would be. After awhile, we just pretty much ignored each other. There were years of his moving out/moving in. We changed the locks on our doors three times during those years because Difficult Child had a habit of coming back and taking things, or leaving a mess, etc.
Our lives and home became so much more peaceful after he moved out the last time.
So, while I most definitely feel your pain, I have no advice. If husband and I had to go through that trial again, I feel certain we would try something different - but I have no idea what. It is such a horrible way to live.
Stay close to the board. It helps.
SS