There are many telltale signs that you may have an eating disorder.  You may have an eating disorder if:

You  constantly count calories, fat or carbohydrates  in an obsessive manner.

You weigh yourself every day and that number on the scale determines your mood that day.

You think about your weight and/or food constantly.

You either eat or refuse to eat when you are upset, regardless of hunger.

You avoid going out with friends because you are afraid to eat certain types of food.

You feel ashamed or guilty after eating any food.

Your eating patterns include extreme dieting or restriction of many foods.

You feel out of control when eating and may have difficulty stopping when full.

Consider getting treatment if you can relate to any of the above statements.