There is something wrong with my mom.

For some reason lately she has turned horribly on me. I have 3 months until I graduate so I am studying as hard as I can (want to be a doctor) and then she burst through my door when she got home and I was in my bedroom doing homework and she screams at me if I've bothered to make dinner. So I said no which I haven't and she started screaming at me telling me that I am the most selfish person she's ever met and I act like a sloth and I am "fucking disgusting". I literally did not do anything at all. I didn't even provoke her because I'm in my room and I didn't say anything. She's so messed up at the moment. 

Last night I had to go to work too at 6pm and she refused to take me so I had to run 4km to get to work in 10 minutes, in the dark in my work uniform (skirt and white top and stockings). I ruined my shoes on the stones, got to work 15 minutes late and my shirt was stuck to my sweat. Then she refused to pick me up so I had to call my boyfriend who lives 20 minutes away. 

I don't know what to do. Can somebody help me?😢

Edit: Now I don't get any dinner tonight and she's out in the kitchen telling my siblings to stay away from me.