The goal for the drastic measures my mom took was to not loose her child. That he stopped being such a big brat was a bonus. He was still strong tempered, but at least he would no longer test my mother. And the threat of a beating kept the rest of us in line. We knew not to test her. All of my brothers and sisters grew up to be decent human beings.
In case you are wondering, my brother never beats his kids, is enough for them to see him mad when they misbehave for them to fall in line.
I concede, had he had a mental disorder it would probably not have worked. In this case though, I'm not sure the OP really had a mental disorder which is why I suggested the beating. Some kids will go to great lengths to manipulate you as much as they can.
Anyway, this is just an anecdote so take it as such.