Help please!!!!!

Back story:

I have had awful periods that have been increasingly worse since age 11; I am currently 16. About 7 months ago I went to a gynecologist because I was having to miss school due to cramps and the lymphnodes in my armpits and breasts were swollen. I described to her my symptoms: horrendous cramps, bladder loss due to numbness and muscle confusion, sharp pain, and faintness. She gave me a quick breast exam (in which she told me I had very lumpy and uneven breasts?), drew a few test tubes of blood, prescribed me a light BC, and scheduled an ultrasound. My tests came back clear other than epstien barr, and a small cyst on my right ovarie. She told me nothing is wrong with me, but I can't be losing a week out of every month!

Now:

The birth control has made me a little more regular, but all of my symptoms are the same. I'm going in for a checkup tomorrow and I don't know how to convey that I think something could still be very wrong and that my symptoms have persisted. Do any of you have a similar experience, or recomendation as to how I can convey my thoughts to her?