I don't know; your eating disorder is your problem that you want solved? I find it a bit strange that if your therapist wants you to go to your pdoc that the next thing you do/say is. . . "and when I told my mom". Why do you not just go to your pdoc? Why do you not talk with your therapist and pdoc about the treatment plan and other options you want. Clearly your parents cannot help and whether they care or not, it would be nice to think they did but they have no experience, understanding or reason/way to look at your problems, they have their own?

I think they assume that the path you are on with therapist and pdoc is a good one/the best they can think of (hence, your mother's, "I didn't know it was that serious"). Have you said to your mother that you wish she would express more interest and suggested how she might do that? She can't read your mind and her perspective is obviously way different! Think about it; if your daughter or friend said, "I'm depressed" and had a therapist and pdoc, what could you "do"? Would you ask, "How's your depression going today?" Not really.

I think since you know "all" about your illness you assume everyone else does/should automatically because you don't think very kindly of yourself so figure if you know something than others should even more because they're "better" than you are? I make that mental mistake all the time. But if you married an astrophysicist :-) would you expect him to feel you didn't care about his job/career? Would you study to be able to ask interested questions about his work? Probably not, the subject would be too foreign.