It's ok to have concern for the results, but the tests are not hard

[biophile]

As mentioned the PFT is just measuring forceful breathing. The NM stress test is mostly boring! I had one - the pharmacologic stress medication might make you feel weird for a minute- some people feel nothing and others think they’re having a heart attack for a few seconds. Symptoms, if any , don’t last long. The nuclear medicine that creates the image doesn’t have any side effects. The worst part is the mandatory waiting times between the injections and the imaging.
So best of luck for good results! We’re pulling for you!