I sympathize. My own mother exhibited some mean behaviour too.

I suggest you talk to your school guidance counselor. As for diagnosing your mother, that is not what we do here. In the meantime seek out an adult you can talk to. If you have no one at school (are you in school? I'm not sure) then even your family doctor is a good start. Most countries have 1-800 help lines for young people. You would be able to talk with someone there.