I am still trying to figure out how to use this site. Lol. Hopefully, I responded.
You did!

I can imagine how living with your mother can cause you a lot of stress. Your older sister is also living there, how is your relationship with your sister?
You've alluded to the fact that your mother at least in some ways treats your sister differently. How would you describe the relationship your mother and sister have, are they close?
It has gotten so bad that I cannot even focus on school or sleep! This usually happens when I have made a recent achievement or something else that is a milestone for me. For example, I began interning for a local journalist and as soon as I told my mother she made it extremely difficult for me to show up to the event. She said things like " you haven't done the dishes? Well you can leave because I'm the authority here and anything you do or say is irrelevant!" Or ". I don't care what you have to do tonight you have dishes to do little girl!"
After that she usually says " I'm proud of you and love you. I have tried to create a childhood that you and your sister could benefit from."
Followed by
"However, I am getting married next month and you're leaving this week! It's spring break. I don't care if you don't have the money or time. You need to leave. NOW!"
Your mother's behavior is quite problematic. We have some resources here that might help you in your interactions with here:
Communication Skills - ValidationS.E.T.: Support, Empathy, TruthThe S.E.T. technique was specifically designed for interactions with a person with BPD:
The S.E.T. communication pattern was developed by Jerold J. Kreisman, MD and Hal Straus for communication with a person with BPD (pwBPD). It consists of a 3 step sequence where first Support is signaled, then Empathy is demonstrated and in a third step Truth is offered.
Few tools are easier to learn as S.E.T. and are as effective in getting across to a pwBPD. Few tools are as universal in everyday life with anyone. It is sort of an walking-on-eggshell antidote.
**As a kid she use to be physically abusive. It got soo bad I had to move with my dad in another state! Now she is just emotionally and mentally abusive.
I am very sorry you were also physically abused by her. How is your relationship with your dad now and is he aware of all the abuse that has taken place? How does he view your mother?
Emotional and mental abuse is horrible too. In fact the underlying aspect of physical abuse that is also very damaging, is the emotional abuse that's part of it. She is not physically abusive anymore but do you feel physically safe around her now?