I'm 28 and period has stopped?

I havent had my period since February and my GP suspects its something calle Polycystic Ovarian Disease. He didnt do any tests, not even a scan. He told me it was nothing to worry about but i checked on the internet and this diease can make you infertile.I am really worried. i sometimes get what fells like period pains but am not actually on my period. I am still waiting for this scan appointment so that they can tell me the truth about whats going on. Has anyone else missed their periods this long?