Hi. I think the best thing to do now is just to relax until the tests are done.
Sometimes people develop shallow breathing and don't take proper breathes - we need to learn to breathe properly. Anxiety too easily becomes the norm. Time out relaxing, breathing deeply, reading or doing a crossword, for example, without the tv on, is important.
More generally, I would ask whether you smoke, whether you are overweight, and whether or not you exercise. These are all important keys to your general health.
I notice a lot of people on this forum are reporting what I would call anxiety-induced stress (females especially, but I expect men too - they just don't admit it). This condition elevates your blood pressure and that can lead to more serious problems. I don't see many people here describing how they relax or meditate. People need to take time out to counter our modern lifestyles, tv, kids, driving cars and traffic, etc.
Just my views on how we live.
Beefy
Re: always out of breath!!! 
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