if you havent done so already...click on the health pages feature on the top right hand side of this page. it has quite a bit of information that might make this process a bit more tolerable.
I wish you both all the luck and love I can. Detoxing off of oxy's is pure hell, It would be better for him to taper off, he'll still have a hard time, but not as bad. If you plan to take this on with him know this, the person you know and love will not be there in the next week or two, he will be sick, crazy, mean, selfish, he's going to be in more pain than you can imagine, I'm not trying to scare you, just know what you're up against. His body will twitch and he wont sleep, he'll be nauseous and have diarea and depression. But oh God, after it's over he will be strong and calm and happy and ALIVE again. I personally think he should go to a doctor, be honest about his addiction and tell him he needs a taper. You hold his meds. Only give him what he is supposed to have. Getting through this together will either break your relationship or make it stronger than it has ever been. God bless you for wanting to help him through this.