I think I have a demon in my house, how do I get it out?

Okay, this is going to sound crazy but I think I have a demon in my house. A few days ago I heard something drop but i couldn't find anything and then that very night I was showering and I wiped off my mirror and saw a dark shadowy figure and kept hearing my name, yesterday night all of a sudden i got very sick and had a high fever, was sweaty and had the shakes. I know I sound crazy but I want to get this demon out of my house. Please help.