He told me we had until Monday to get his money or he was going to cause us hardship with our business and see us homeless .
Oh, really.
This implies he's got enough discipline and control to suddenly turn into Frank Underwood/JR Ewing/Michael Corleone so he can implement his dastardly plans. When someone is in the depths of meth addiction, I doubt that person's ability to go all Machiavelli very much. They're too busy destroying themselves.
I agree with Ann, however, when she speaks about your personal safety. I would be concerned about that.
It is time, in my view, that you took the gloves off. A threat has been made, so you need to respond accordingly. The locks should be changed immediately. A security system should be installed. And you need to speak to the police.
I know he's your son, and I know that this breaks your heart. But you have to set those feelings aside and do what is necessary and proper to protect yourself.