How are you and how was your day and whatever...

[Catherine]

I don't think you need to worry about him. He is to sick to do much and he is not going to be around for long.
Call the police if h comes to your door. If he left a threatening message you can report it. It is against the law to leave threats like that.

He has no power over you unless you give it to him.  He is a coward and a bully and they always back down when you stand up for yourself. 

Carry a nice big umbrella. It might rain anyhow and an umbrella is useful for defending yourself.