How to deal with an unstable parent?

I think its best that you don't stay with her. During your long breaks try and stay with a friend or get a job at your school and stay in the dorms. I know some colleges have rooms left to stay in you just have to pay extra, try looking for a job to cover it. With distance on your side, try calling her, skype or visit her just for the day. I think you should also consider seeing a therapist, they can help you through this. Therapists are familiar with these kinds of problems and they can offer you advice on how to mend your relationship with her. I hope it works out!