Help with night paranoia?

I have major trouble sleeping at night! I'm always afraid that someone will break into my house and kill me. I honestly lay staring at the doorway for hours every night just in case I see a shadow walk by and I might have a split second so I don't die. I check every single possible hiding spot big enough for a body before actually laying down and then I close doors and set things behind them so it would make noise if a person opened it. Every single noise I hear is absolutely terrifying because my brain thinks its some person walking around. This is been gradually getting worse over the last year and now I don't get very much sleep at all. I'm tired all the time and its starting to affect my life negatively. How can I help myself here?