Odd things going on w/ my period?
So, I'm almost 15 years old, use pads and not tampons, have never been sexually active, am a vegitarian and started my period when I was 13. When I first started it was a little irregular, but I was assured that that was normal, and since then it has calmed down a bit. But recently I've started getting these horrible cramps. I mean, cramps so horrible that I can't go to school, I can't stand up w/out pain, I can't do anything! The last time it happened my mom and I went to the doctors and they said that it was a kidney stone and that it happened during my period was just a coincidence, but now it's still happening, and always during my period! It's this horrible pain in my lower abdomen and sometimes shooting down into my leg. And also, just recently I noticed that my pad usually has very little blood, but when I go to the bathroom, a lot of blood comes out... and this has never happened before. Are these two things related? What's wrong with me? Please help!