<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing chills, sharp abdominal pain and heavy menstrual flow. But sometimes, my menstruations are absent and I also have burning abdominal pain. What could be wrong with me?  <response>: Based on your symptoms, you might be suffering from endometriosis. This is a condition where the tissue that lines your uterus grows outside it, causing inflammation and pain. 