Ok. This is not your fault for one. For two, you need to get out of there. The government can help in situations like this. Call the police. Show them the note. They will be required to provide protection for you.
And if they won’t help, just get in a car and go. Start a Go Fund Me. Get as far away as you possibly can then worry about finances. Go to a hotel. Explain the situation. See if they will let you stay the night or for a while for free. If one says no, then keep trying until someone is willing to let you in.
And if worst comes to worst, fight back if anyone comes. Get some sort of weapon even if it’s just a kitchen knife. Punch. Kick. Scream and do everything to get out of that house.