It sounds like you need to get out of there.
Do you have a safe place to stay?
Do you have a safe way to support yourself?
Do you have a plan to continue school?
Your site shows you are a smart person, so I know you can get yourself organized. Then you just need to set a date and time to escape to a more sane environment. After that you can call and say you are OK. Trying to publicly leave may get you asaulted again. Leaving with the police or one of your friends as an escort will probably cause long term resentment. Don't burn your bridges, but do escape.
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When I lose an obsession, I feel lost until I find another.
Aspie score: 155 of 200
NT score: 49 of 200