Join Date: Aug 2009
Location: New South Wales, Australia
Usually there is a reason a horse acts like this, they don't just go through "mental stages" at least not repeatedly.
So you need to find out what caused him to act like this. Could he be in pain from a poorly fitted saddle? Other tack problems? Could he have a sore back? Or do his teeth need to be done? Maybe he doesn't respect you, and has taken advantage of you.
Although, the problem you face now is that, regardless of the cause, your pony has learned that if he throws you off he doesn't have to work, and may very well throw you off again
So, in my opinion, there are two things you need to do. First, you need to discover the source of the original problem and fix it. Second, you need to retrain him so he learns that he can not throw you off and he cannot get out of work.
Although, as he has succeeded in throwing you repeatedly, you will likely need the help of a trainer so that you can fix this problem.