Hello, Thanks for posting your query. What was your hemoglobin level when you were diagnosed as being anemic? What treatment did you take for the anemia? Heavy menstrual flow can cause or worsen already existing anemia. The heavy flow could be due to hormonal imbalances or due to local causes in the uterus. Severe anemia can cause fast heart rate. This is a serious condition. It means you are going in for cardiac failure. Kindly make an appointment with your doctor to get evaluated. He would ask you to do the following tests: Complete blood counts (CBC), Hemoglobin level, etc. In the meantime you can start taking some iron supplements like Fefol Z capsules one daily. Include milk, milk products, and green leafy vegetables in your diet. Regards,