Listen, any therapist or self-proclaimed expert that tells you "just don't do it" have as much qualifications to be treating you as someone baling hay. Run as fast as you can from them. Next, eating disorders stem from anything from Post traumatic stress disorder, abuse, body dysmorphic illness to fill in the gap. In dealing with my own daughter's severe eating disorders I have learned that it is a disease (like diabetes, high blood pressure) that rears it's ugly head and becomes an addiction as well.
This addiction has more power than you and you can't become better without education, strong support from friends/family and many times outpatient treatment (with my daughter who started "slowly" as you seem to have been doing, she is now in an inpatient residential long-term, <edited>. I have seen Mr. Ed (that's what I call eating disorders) literally take over her ability to think logically and realistically. Her perception of what is real is a reality someone without Ed would consider "insane". She is having a chronic, constant struggle within her brain and body. She is not insane, but addictions will cause you to make bad decisions and bad actions while justifying your behavior.
I wish you success with all my heart, but just remember you have a disease that can never be cured (there are science studies that say genetics can be part of the problem, so heredity can count). While you can't cure it completely, you can control it (like one would control diseases of diabetes, high blood pressure, even cancer) with the use of medications (if helpful), individual and group therapy, and talking about it <edited> can be helpful. Try to put together an array of strong support and know you did not cause this. It just is what it is, but you are responsible for your health. If you had high blood pressure you would not just stop taking your meds, thinking it will go away by itself if ignored. And neither will an Ed.
Warm regards....and get a good therapist (call a treatment clinic who can give you referrals).