Hi R.,
You just have so much going on, It's amazing you are still standing!
You might consider an alternative to the reward and punishment system you are using. I know they are popular, but they are basically all about conditional love. Instead, you might consider the concepts of consequences, encouragment and problem solving. I love reading and have found certain books very helpful in developing this kind of discipline for my stubborn son. The Postive Discipline series is really great! Also, Raising Your Spirited Child (saved my life when my son was a toddler). Also, on my list to read, the author Alfie Kohn. He really develops the ideas of avoiding reward and punishment, with research to back it up. Here is a NYTimes article you might find interesting:
http://www.nytimes.com/2009/09/15/health/15mind.html?_r=1...
Also, as a former difficult child, I can tell you that no punishment is a deterrent when the payoff of driving your parents crazy is so big. There is untold power in getting a parent to see red. I would take a spanking and laugh, just to get more, somehow understanding that I was in control of the situation in some weird way. With a child of this temperament, reward and punishment are particularly ineffective. If you can develop ways to sidestep power struggles, give your child more control (though very much in a child appropriate way), you will have much less frustrated, calmer child!
You might also consider the concept that stubborness is a very useful and valuable trait and that it needs to be harnessed instead of squashed. It's so hard to look at a very difficult frustrating trait and put a positive spin on it, but stubborness has an up side later in life, if it can be harnessed as persistance!
I've gone through a lot with my child. I know it might sound a bit flakey or too "alternative" to many people. It's so hard to escape the way we were raised! It's so hard to escape the idea that we can't let them get away with it, there must be a punishment. I think it is brave to reach in a different direction. It is not one bit about being permissive, it is about teaching a child, setting boundries, lovingly guiding a child and giving them the pride that comes with being part of the solution, having a say in it. It's so hard because for a lot of kids the reward/punishment works in the short run, but in the long run, they don't learn what we really want to teach them (self-reliance, presistance, confidence.
I wish you the very best during some very difficult transitions, and beyond!
C.