An answer to "Afraid of eating more in case I don't burn all the calories"

That is the nut shell of anorexia, isn't it? To overcome the fear is the hard part. What I have found helpful is to put new things into my mind that neutralize the fear. I am sure you know what can do that for you. To look at skinny models and compare your body to them will never get you out of the mindset, so you need something healthy to compare your body with instead. You have to want health. Then the fear will be replaced by that desire. Either you want to be skinny and fear gaining weight or you want to be healthy and fear sickness, you know. Many have to be near death to choose health. Then they find that the fear of death or illness is stronger than the fear of gaining some weight. Only that fear was stronger, than to lose all their friends, their lover, the connection with parents, their job or ability to go to school. You have to actively choose differently, go for something else. Replace the goal "get skinnier" with something else, like " get stronger" or "get more energy to go to school" or what ever you desire in life and will make you more happy. You can't wait for someone else to step in. You are in charge. You know what you need. You must hold on to the fact that you are valuable even though you haven't been able to show it lately when you were ill. Nourish yourself and you will be able to nourish others.