i have pcos, and i suspected it for a long time before actually getting diagnosed.
the main symptoms that i had were completely absent cycles...i hadnt bled since coming off the bcp...and its been so much longer since i had a natural cycle. other symptoms can include struggling to lose weight, excess hair, trouble with acne....i have a bit of trouble with acne, but thats about it. and of course it can vary from person to person quite a lot.
hope your appointment goes well - if they say that you do have pcos, theres loads of support on here...i made a group for pcos'ers, which is really nice. its good to have people who understand how it feels, and the different ways they are dealing with it. its called young pcos'ers..but you can join regardless of your age really!
good luck with everything xx