OK, lets work on practical strategies to get your basic needs met while you have to live there. Do you have a lock on your bedroom door? I have lived with and near lots of people I felt I had to hide from and it's not fun at all. Geez.

Can you keep a stash of food, water, meds, etc in your room?
I know you city girls are gonna giggle, but, us country girls know you can make a really good pee bucket from a gallon milk/water/juice jug. Cut out the top part opposite the handle. You can even pee standing up with it. Pour deposits down the toiidy when the coast is clear, rinse and ready to go for the next round.... PooPoo's a little trickier....... let me know if you want to go there and I'll give ya some suggestions.

Some people are energy vampires. I hope you find help to get her help to help yourslef....... if you know what I mean. . . Everybody should have a warm dry pleasant safe home. When I find my magic wand, look out!!! No bad guys allowed!!!