Probably start talking to Jesus immediately. Tell him everything. Not just this. All of it. Ask him to forgive you. Tell him you accept him and believe. Ask him to show you the right path and go give you the strength that you need to get through this.

Jesus will help.

And at the very least if Jesus can't save you on earth from this demon. He can bring you to heaven when it does chew your neck out like Stella's. Then you won't have to go to hell and forever live with the demon that killed you.

Also, a Bible. Get one of those. I feel like you might also talk to someone about an exorcism. ...