mind games and guilt trips galore

my mom is very short tempered one minute she will be fine and next thing you know shes screaming and yelling at me and my siblings she likes to manipulate people without looking like it and spends all our money on internet get rich quick scams and numerology type things today she was mad because she had misplaced a book she had ordered online she had us lift up the coach (yelling the whole time) i went into her room and there it was on her bed just where she left it i bring it out to her and she is still mad at me! she put passwords on the computer so i cant work on my website . and she treats me like im a useless freeloader even though everytime i try to get a job she wont let me. she used to be the greatest mom in the world now she is grouchy and just MEAN for no reason at all i dont know what to do anymore im stressed out and im tired mentally i can take it anymore but theres nothing i can do if i run away my little brothers will be all alone with her and i couldnt live with myself if i did leave but for someone who likes to manipulate and lie to she is very easy to manipulate herself i dont know what to do and i feel so alone in the world life is miserable my brother may have a cancerous tumor and she does nothing my older sister is gone all the time and i never get to hangout with her anymore im stuck at home with nothing to do all day anyone have any advice for me cause im out of ideas ive tried everything