I'd first call his sponsor(if he has one) or anyone from AA and if that didn't work, I'd call the authorites. At least you'd know he's safe for the night. Yea..he may be pissed at first,but that's his own fault for putting himself and YOU in this position. Especially with the constant back/fourth,he has to truly know where he's at in his addiction and if he says he doesn't..he's lying. He called you for help,so let him be pissed off at you for calling in help for yourself with him.