Eating disorder and bleeding.

Patient: I have been dealing with an eating disorder for close to eleven years. I haven’t had a period since I was 17 years old, i am now 29. My current weight is around 82 lbd. BMI is really low. I have noticed when going to the washroom that threre is blood. What is this? Am i mentrating, or is it more serious? I am afraid to go to the doctors to find out. What are possible senario’s?