lily, a a recovering addict I want you to know that I was unable to detox without medical care. It was just impossible for me.
As the wife of an addict I let AH try to detox at home several times. It never worked. He has detoxed twice in rehab and once in jail. I've been where you are. I even bought him weed to help the withdrawls, but the fact of the matter is that nothig eases the pain of his withdrawls without medical intervention.
When someone is given methadone by a doctor it is taken orally, not injected. To slam it is using. Of course he got even more sick after using methadone. The withdrawls from it are worse than street opiates. Speaking of opiates... It doesn't matter what they're called, perc, roxy, oxy, etc... They all are the same thing: heroin
Drinking doesn't ease the pain of withdrawls. It only makes them worse. There's nothing you can do to force him into treatment. All you can do is let go, or be dragged.