That means you need to go to the doctor and see what the problem is. I am 33 and have been dealing with that problem still since I was 16. Go to the doctor, they can look into the problem and help it to stop. You don't want to get the point of being anemic, which sounds like you may be already. Bleeding for 15 days is a long enough time to be bleeding. I bleed for 3 months at one point in time and I had to have a blood trans because i was so anemic. Please go to the doctor!