I'm so sorry you are having to go through all of this. I wish your mother was more sensitive and supportive for you. I think it's wonderful that you have a job and are making your own money. Since you are an adult now it's great that you are taking steps to be responsible for yourself.
It's great that your brother came through for you and you have someone to live with. Life is so much better if you can have friends and family with you.
I hope you continue to find your independence and happiness.