I have had a nuclear stress test and it was less scary than it sounded. My dr said that it was actually less stress on me than a treadmill test would have been. It lasted about 15 minutes. They give you medication and for me, it just made me feel a bit warm. I had to talk and answer some questions and I had a few minutes I felt a little breathless, but nothing scary. I was okay because I had been told that if anything were to happen, they had something they would give me to automatically stop the test. You will do just fine. Best to you!