hk, I know you are not here for just sympathy, but you have mine. The person you fell in love with is still alive, but he has fallen under the spell of oxycodone (brand name percocet with tylenol).
I am concerned for your safety. Do you have relatives nearby that you could stay with? At least let them know what you are dealing with. The oxycodone will make him do things he would not otherwise consider.
Bear in mind I am just some guy on the net, but I have lost friends to drug addiction (they od'd and are dead now). If your husband keeps snorting he will die. The only way he will quit or seek out help is when he bottoms out. The desire to change has to come from him.
My unqualified opinion - get the divorce before he spends all your money or he gets violent. You can do all of that in the safety of a relatives house. No matter what a hassle it seems like, just think of what ten more years would be like. What if you have kids? Then you will have too much invested and you will not be able to escape.
If you have the time read these addiction boards and get an idea of how tough it is to quit just taking oxy orally, let alone snorting it. Your husband is not in his right mind.
Reachout gave you great advice about the support groups that are available to spouses.
Now if your husband has a chronic pain condition then he needs to go see a pain specialist and a psychologist who deals with chronic pain patients. I thought a psychologist would be a waste of time, but the one I saw gave me an excellent education and helped me understand the chemical changes that take place in your brain when you have chronic (daily) pain.
Well, sorry for the preaching, but I am so sad for you. Will you please update us here occasionally if you have the time? Bless your heart. I will be thinking of you.