Hi Katie,
Well, I went on birth control pills when I was 16 because I was having rough periods not for actual birth control. I was having terrible cramping that would keel me over and I just wanted to curl up in a ball and cry! My periods were also heavy and lasted long (7+ days). My mom brought me to the family doctor who recommended birth control pills to regulate hormones and my cycle. Of course, now that I've been on it for over 4 years it's come in handy as a birth control mechanism too! But when I went on it I was a virgin and it was only for my period.
I just went to the GYN for a routine pap smear and physical exam (we went over my health history, family history and she did a breast exam). It wasn't painful at all, she made sure I was relaxed and that I was comfortable. She also did an STD test, even though I wasn't sexually active. I'm not sure why? Maybe just because it's routine. Then we discussed my symptoms and she prescribed me the pill. I didn't have any blood drawn or anything like that. Just a routine pap smear and some tests.
When you go make sure you tell her all your symptoms so she can give you the best fitting prescription! I'm still looking for one that give me few symptoms but let me tell you, being on the pill reduces my pre-period symptoms big time! Good luck and don't be nervous!