Talking to mom...

Mad
I need some advice about how to talk to my mom. I believe I have PCOS, I have irregular periods, I have gained 30lbs (that I worked my butt off to get off) come back over 6 months, acne (I wash my face twice a day), i have horrific mood swings, prolonged period length, and bad cramps. I have never had that close of relationship with her. I just turned 15 years old, I would actually like to go and just make sure everything is right, but I just don't know how to bring this up to her. Any tips and advice would be great! 
Also, she has PCOS!