How To Get Rid Of Prolonged Menstrual Cycle?

hi how do i treat period cycle that lasts at least 3 weeks.
1st will be a creamy discharge
2nd will be a slight brown with a slight fishy discharge
3rd week will be when my uterus starts contracting and i heavy bleed for 5-7 days. I have been to countless doctors and visited many hospitals but no one has been able to help