I am fifteen, and Tomorrow after school I am supposed to make an appointment for myself for a physical. I haven't been to the doctor since seventh grade, (I'm in 10th)When I was thirteen, I kept an online journal, and i wrote an entry about my mood swings, and how sometimes I even wondered if I had multiple personalities, and how any little thing- or nothing at all- would send me flying into a different mood, and someone told me that sounded like bipolar. Since then I've done a lot of research, (to the point where I can recite all sign and symptoms of bipolar I, II, and cyclocythemia) Personally, I feel I am Bipolar II rapid cycling. . when I first started reading up on info, I felt the information defined me in ways i couldn't put into words. Since then, I've thought about it pretty much every day, and i have googled it to exahustion. last year, I decided that I would bring up the subject with my doctor when I had my physical this year. I promised myself that I wouldn't back out...
but I want to really bad.
I don't want to be labled as a mentally ill teen,
I just want to continue on being just me.
My logical side tells me that I need to do something now.
However, my more emotional side tells me that I've been normal for the past week, (something that is highly rare) and that I can wait. That I can manage it better when I turn 18, and I have a choice over who knows what.
Again, my logical side tells me thats ridiculous. That I need the most support I can possibly get.

General tid bits of info:
The sanity test here pointed out bipolar as my only major concern.
The bipolar screening test here suggested I'm bipolar,
the bipolar questionaire and the other test where you read a paragraph and tell how much of it is like you- all suggest I'm bipolar. (On the paragraph on I scored a 21, 19+ is highly likely bipolar)

Help? Advice? Words of encouragement?

Thanks.