Well, to me it seems like enough calories, although I am very short and petite not to mention that I have a biased anorexic opinion.

Have you seen a dr. about this. I would be worried about something being physically wrong. I think you should get this checked out. Weight loss, loss of hair, lack of period, could be a number of things.

Lastly anorexia has a huge mental component. How are you doing in that area? I think the mental attitude is key when talking about eating disorders, the disordered thinking is usually where it all starts.