Your mum does care, when you told her she probably did not know what to say cause she was really worried about you. I think you should go speak to a doctor to get help because you are going to get very sick with the way you are. You what is a thing you should be proud of, its the the fact that you have recongised that you have bulimea which is a tuff thing to do with any sort of situation because people don't want to admit when something is wrong. So you should be proud of yourself. If you need someone to talk to I am always here.
Do you have many people around you that can support you?

Take care