You should consult a doctor. (S)he'll ask you relevant questions, and will be able to clear things up. Not getting your period for a couple months is quite commonplace as far as the people I know go. However, one of my friends didn't get it for quite some time, and she had some sort of hormonal imbalance. Another friend of mine was diagnosed with
link. Don't panic though. I'm not giving you examples to scare you. Only so that you see the importance of consulting a doctor. And really, don't freak out. Keep calm and... visit the gynec.