Doc should have given you enough oxycodone to get through the withdrawals. You can't just stop cold turkey. I was addicted to Percocet after a surgery and it took me 6 weeks to get off of it, at the end I was only taking 1/4 of a pill, but it was the only way my body would let me. I was shaking (like full body back and forth) and absolutely freezing just a few hours into it.

This discussion mentions phenergan (allergy med) to just knock you out during this time. It goes over people's experiences with withdrawal and how long it took:
http://www.drugs-forum.com/forum/showthread.php?t=32574

Does your doc have an answering service? I'd call his office and find out. He can call your GP so he can write you the prescrip?? Or just don't care about how you feel around your GP and call anyway. This is not a good feeling and it sucks that they didn't prep you for coming off of it.

And what the hell about your disability? I'm so sorry.