If you have anorexia and they are refusing medical treatment, that is abuse. Anorexia is a serious disorder and needs proper treatment, both physical and emotional.
PLEASE see your own doctor. If they are a pediatrician, tell them what is going on, briefly and succinctly. They HAVE to report it even if you aren't saying your parents are evil brainwashed idiots. (oops, sorry). Your parents can be hateful and vindictive, or they could have the sense knocked into them. If vindictiveness is the ruling thing, then you need to run to child protective services. If they are going to put you out, get it done NOW, because the state will at least try to HELP YOU FOR REAL. Schools, local youth centers-a lot of places will help kids who need it, especially when you are a good kid, just trying to survive, not running away and committing crimes. ASK for help in the simple ways, first. Give your parents a chance to get educated on the harm they are doing.
If, when you are 18-if they do kick you out, you will have some friends here and elsewhere and hopefully will have developed some resources. You need to start looking after your future NOW, your parents sure the hell don't seem to be.