Only the dreamer can be sure of what a dream means... but here's where I would begin thinking about this...

actually, I think you have begun to think about it... this friend of yours appears to be a friend, even though you have to verify at what times you are telling her the truth (as opposed to times you don't?) I think you are questioning HER telling you the truth, or appearing to accept YOUR disorder.

I would also look at your eating and using the bathroom and NOT purging. That sounds hopeful to me, if it is so...perhaps you are healing and if you can feel that "okay" feeling of eating and NOT purging, and keep that sense with you when you eat, then indeed healing process begins.