It's a pity u don't live in australia. I could get u the help u need immediately.
Anyway, someone mentioned suboxone...not bad idea. It will get u thru no problem. Even when it's time to come off it, you won't do it hard.
See yur GP and talk with him about. I understand ur pain....beleive me i do and i can totally emphathise with u. You don't need methadone!! Try suboxone