That's great news that you'll be starting at university soon - definitely stop into the counselors' office the moment you get there. Don't worry - everything they do is confidential, and they've seen it all. And don't wait - the stress of university can exacerbate HA without help. (My sister waited a year to speak to her university counselors about her depression... when she finally went in, she said, "Why didn't I do this sooner?! Last year would've been so much easier!")
In the meantime, take a look at those CBT links. CBT techniques for health anxiety absolutely work if you're diligent about them. The trick is that you have to remember to do them when you're cycling (worrying)... it's hard, because we tend to get obsessive and can't think about anything else.
So the trick is - when you feel yourself start to worry about a symptom, immediately start doing the techniques. And you repeat them every time you start worrying again. Fairly soon, your mind will build new pathways and you'll start to do the techniques in your head automatically. And then you'll realize that you just don't worry as much or as deeply as you did before.