What Causes Heavy Bleeding During Menstruation?

Hi, may I answer your health queries right now ? Please type your query here... Hi, am 22 years old. I took an abortion pill n i bled for some weeks. The bleeding stopped and then later continued for the next two months. I took another pill(primolut N) to stop the bleeding but it became more heavy after some days i had very painful lower abdominal pains with constant purging and headaches. Evetually a solid tumor-like mass came out. The pain has stopped and bleeding has reduced but haven't stopped. Pls i need to know what is the problem with me and what are the possible solutions?