Maybe you can post him in the adoption section of this board? Or perhaps try to contact the arab experts on this board (Eagle View Arabians and Arabians and Other Aliens jump to mind, but I know there are others), and depending on where you're located, perhaps they know somebody who may be willing to take him on. This site is a great resource for people experienced with "problem horses," so just keep posting, and I'm sure somebody can point you in the right direction.

Also, I've never tried this, but I have a friend who swears by "animal communicators." I don't know if it's bogus or not, but it sure works for her. In fact, I'll start another thread to see how people feel about this - maybe it's an option for you?