I'm sorry that you had to learn the hard way not to try to get between an addict and his drugs. Remember, night of the living dead? He is a flesh eating zombie who looks like your husband. Your husband is gone right now.
Did you get him to sign the paperwork yet? The sooner the better. You are really playing with fire every time you go around him.
You didn't cause it.
You can't control it. (and neither can he.)
You can't cure it.