Some things cannot be fixed. I urge you to get a qualified behaviorist (veterinary) to evaluate him. If he is truly unstable, rehoming him is not fair to him or the new home.
Tegs,
Sorry that it took me a while to reply. I would love to trade pics with you. Everyday that passes, I am reminded of the Basenji Code. She is a bolter, I am happy that we have a storm door to help.