My Mom needs psychological help and I don't know what to do

She's diagnosed with severe depression and bipolarism. She's cheating on my dad, and has mentally abused me my whole life. Recently it has gotten extremely worse and even a little psyical. She throws things around and has hit my dad in front of me. She wouldn't let me leave my room until I threatened to call the cops. I know deep down somewhere she loves me but her mental breakdowns are destroying the family. I seriously feel like we need to go on Dr. Phill. I'm 19, broke college student living at home bc I have to pay for everything. I hurt every day. I don't know what to do. Help.