Oh god Elaine … sorry to hear that . Must be really hard ..
You mentioned drugs but what drugs is it just cannabis or cocaine as well ?
As far as I know cannabis doesn’t have that kind of effect on a person to make them act out like that .. it’s the drink ?.
My advice to you is just give him an ultimatum to stop taking the drugs and drink or at least try to cut down and see if it makes a difference or tell him your leaving if he refuses to make changes ..
And make sure you mean it when you say it otherwise no point because you will end up in a cycle and he won’t take you seriously.
Have you tried talking to him when he is sober and explaining to him what his drugs and drink is doing to everyone around him