My daughter has irregular periods ever since they started. Lately she is having periods for as long as 20 days . And after few days the cycle repeats. Bleeding is very low like drops for a week and then good flow for a week. Right now we are giving her pause tablets 500 mg once day to stop the flow. But once we stop it the flow starts again in a day or two. Pls advise what shd i do to settle this problem.