Dear Sir, I Have Been Experiencing Heavy Bleeding For Some

dear sir, i have been experiencing heavy bleeding for some years now. Last year i got a Dand C done, but all was normal. I keep taking novelon on and off to control heavy bleeding. Lately i had started spooting 5 days before the periods and then normal periods resumed. The dr again prescribed novelon which did not work. I have been blleing since the day i have started taking novelon i.e for 12 days now. When i consulted the dr she immediately stopped novelon and put me on Regestrone. 5 mg 3 times a day for 5 days and then 2 times for 15 days. Then once periods resume, again novelon for three cycles. What exactly is the problem with me? kindly help