At different times in life, someone may have anorexia nervosa, bulimia and binge eating disorder, and an active eating disorder often has mixed features, but the hallmark of anorexia is three or more missing periods in a row, body weight that is less than 85% of expected, and an intense fear of gaining weight.  Bulimia is characterized by a cycle of binge eating coupled with inappropriate compensatory behavior, such as vomiting or misused laxatives, diuretics, or enemas that occurs on average, twice or more a week for 3 months. Fasting and excessive exercise are also inappropriate.  But regardless of what you call it, you have an aberrant eating pattern and you seem to be caught in the trap of yo-yo dieting.  See you doctor and read Dr. Michelle May's books about ending the diet-binge cycle.  See her blog on Calorie Count today.