Lynnjenn, the only time I was in physical fear of my son was when I was witholding money from him. We had a joint bank account requiring both to sign (me and him), and I refused to allow him to withdraw money when he was on a relapse roll.
Tell him you paid the rent, that may get him to back off. If he thinks you still have it, you could be in danger.
I'm sorry you are going through this. I suggest you protect your own bank account and other money, if he can get at it he will, that's the sad truth of addiction.
I am sorry you are going through this, please don't feel bad if nothing you do works. You can't reason with insanity, it's that simple. If love could save an addict, not one of us would be here.
Good luck.