Mass rehab is not a hospital. It is an umbrella agency that can connect you to the resources you would need to live on your own. There are many programs that fall under this state agency and it would help if someone could help guide you. State agencies can be bueracratic hell, but once you get funding, you are in.

Some hospitals have day programs but you go back to your own place at night. You might miss a week or 2 of school. And your mom can't treat you any worse than she already does.