my god, you've only been there for a few weeks and you're already having problems? Tell him, "If you haven't noticed by the glazed over look in my eyes, I feel like a nuclear bomb's replaced my head for the time being and it exploding from my fever might be making all the noise soon. I'm sick, GTFO."

Which, in itself, doesn't make much sense but you're sick so you don't have to make sense.

Then slam the door. If he pounds on it more, call the police.

Or so I would do.