I'm so sorry you have to deal with this.
If he doesn't want help, there isn't much you can do but get out of his way.
If he threatens you in any way, call the police. They will come and get him.
If he has threatened suicide, or he is injured, call 911, and they will come and get him.
If he tries to get in a vehicle and drive, call the police and give them the vehicle information and they will find him.
Otherwise there isn't much you can do. He is an adult, and if he wants to be drunk and disorderly at his own house, he has every right to do so.
Just do your best to stay out of his way.