I am studying disordered eating at university which includes all forms, AN, Bulimia, Binge eating and EDNOS/OSFED . Whilst completing research I came across this site and read a lot of your stories with great sadness.
In many cases the eating disorder (ED) can be due to worries/concerns over other areas of life and the ED is a way to mange those thoughts and feeling or distract from them.
Please don't suffer in silence speak to a GP, teacher or parent/carer. The Beat website can offer some very good advice and may local group in your area.