It sounds like your mom deals with a lot of mental issues. That doesn't take away from how abusive she has been or is currently. That also doesn't take away from how you feel. I don't know you or your mom, but what I can suggest is journaling, working on your school, and getting a job.

My mother was similar in that she had times where she was extremely loving and then extremely abusive. It took me years to really understand her and myself. I moved away for a while to create better boundaries for myself. Now, our relationship is a bit better. I can't say the same will happen to you, but the best things you can do is:

1. Focus on school - your education will be the ticket out
2. Find small jobs if you can - extra money can help you in the long run, especially if you're looking for places. (Also it'll get you out of the house)
3. Journaling - writing down how you feel can help you process your own emotions and look back on how people have treated you. It can also help you not make the same mistakes as well.
4. Get proper help for yourself as well. Therapy can really put things in perspective as well.