Yeah, your friends don't sound very sensitive. Have you mentioned you don't appreciate the comments? That's the first thing I would do.
I'm sorry you're having these problems. It's not easy to deal with this stuff. Also, Christina mentioned a good point. You cannot be exercising healthily if your body is not getting enough nutrients. It will feed off the fat in your body, sure, but not for long. It will start feeding off the muscles in your body, which is often what causes the more serious side effects in people with EDs, some of which can be permanent. Your heart is a muscle, think of it that way. I'm not trying to scare you or give you **** or treat you like a baby. But it sounds like you may need some medical intervention. Do you want to stop? Or are you still ambivalent about it? Do you want to recover or just lose weight? Two very different things...