Need help writing an essay about The Tell-Tale Heart by Edgar Allan Poe?

The theme I'm using is Sanity and Insanity, and a thesis idea is arguing that the narrator is insane despite the fact that he insists he is not. I need this essay handed in tomorrow, but I've been doing work for other cles so I didn't work on this. I really need some help. I just need a thesis statement and three arguments I can use for the essay.. any help is great. Thanks.