Why won't she go away.?

So this girl won't leave me alone, takes advantage of me at my weakest moments, like when I'm sleeping. I can't figure out how to make her go away.

I started drink to the point of being incoherent every day, stopped taking showers and washing me clothes hoping to keep her away, but now she says "your so punk rock" and thinks its cute. I even left her a note in her mailbox that says "your dead to me" and she thought it was funny.

I can't get her to stop showing up at my house when I don't answer her calls, shes already kicked my door down so i can't even lock it anymore. For some reason she doesn't understand the meaning of get out of here and leave me alone.

I don't know what else to do. If she shows up tonight I'm going to vomit on her in her sleep, hopefully it works.... Anyone else have good ideas?