Re: dependant on percocets..
The best thing you can do for a withdrawal is not take a narcotic. You will addicted to that (considering your addictive behavior). I understand how hard this is, believe me. However, this will only make you stronger.
I have been in many car accidents as well, and I have serious back pain. I am going to a chiropractor who is treating me very well. I am an addict/alcoholic so I do not take narcotics of any sort. I have wanted to, however, those are the devil! Addiction can kill you. It's harsh but it's true. In my opinion, you should try NA or AA. You will find support there from people who have been in your shoes.
Please let me know if I can help you