I'm scared!!!!

So I'm only 14 and my periods for the last 5 months have been very weird!!! I have SUPER bad abdominal/pelvic pains. It isn't a cramping pain tho. My period blood has gotten MUCH heavier. Other than the pelvic pain, sometimes the pain shoots down to my vagina. We went to the doctor and he said to take some antiflamatory pills because maybe my uterus is swelling up. I took the pills and it didn't work at all. I saw a link about ovarian cancer... I read it, but it didn't seem too reliable. So I researched it and I had almost every symptom. So we are going to go to the doctor, but any ideas of what could be going on? I'm super confused because I think I'm too young to have ovarian cancer...