What are symptoms of anorexia, other than major weight loss?

I recently went to the doctor, and she made it very clear that she didn't want me to lose any more weight. I am very strict with my diet, but I'm concerned that I could be overdoing it. Lately my stomach has been giving me problems. I'm curious about symptoms of anorexia, that perhaps I am dangerously close and don't realize it. Any insight is appreciated.