Do you have other family members who can help you?
I remember reading about this in psych courses, but have not dealt with it at all outside of the classroom environment. I applaud you for at least recognizing that you need help and taking the steps to get that help. I am sorry that your mother is causing so much pain in your life.
It sounds like not only do you need help but your mother does as well. Do you have older siblings who can help you?