I know how you feel. I used to be like that. But then I was sent to treatment. they said that it is up to you to do what is right. even if you arent hungry, you have to talk positive to yourself. And if you feel like you are gonna throw up, sit down and try to calm yourself down. right now I am in high school. And it is really hard to control myself at school. but I know that there are always people in the bathrooms, so I cant just go in there and throw up. because if I do, I will be made fun of.
Anyway, I am not to good at giving advice, so here is my best. if you want to, you can send me a private message.
Good Luck!