You said you live with your grandmother so it's your grandmother that's treating you this way? Is it possible she has the beginnings of Alzheimer's?..maybe you could call adult protective services & explain her behavior & how it's not safe for her living like that....they should come out & investigate & tell them about the police....I'm sure they have some written reports that APS could refer to also. They might deem her incompetent & force her to get some help.

Sometimes we have to leave bad situations...know working & school makes it feel impossible....but it's not. Staying may be more difficult.