Your history of having irregular periods with bleeding for 10-15 days suggests that you have hormonal disturbance. There are many causes of irregular menses with excess bleeding like hypo
thyroid disorders, progesterone deficiency, anovulation , tumors of uterus, cysts in ovaries etc
Next Steps
You need to meet a gynecologist and get evaluated. Blood tests, sonography may be advised to know your problems in detail and then medicines may be prescribed. If you are married and completed your family, you can benefit from some tablets like OCPIlls and if you are desirous of having children you will need other treatments.