Well you've been enabling him for so long what do you expect. I don't have much room to talk seeing that I'm the same way with my brother. A pint here, a beer here. It sucks but I know he'll go into withdraw and it's dangerous. When I'm sick of it I just ignore his calls, tell him I'm broke ect. He gives me a guilt trip and can be forceful but ignoring him or declining his calls is all I can do. You say you're scared of this man? Next time he rings your door, call the cops if you have to. It might do him some good. Tell him you refuse to help him unless it's to get into detox. And if he gets sick, don't feel like it's your fault. I know it's hard but it's about all you can do. Keep him blocked and good luck!