I can understand, I'm not sure the difference as I only knew of the treadmill or chemical. I thought Nuclear and chemical were the same basically. But I have looked it up and I now see the difference. The article I read made it sound better to identify issues where a regular one didn't get the results expected. My thoughts and prayers are with you that you can get thru this test. Please let me know how it works out. Here is the article I read that may help. Basically issues are very rare , I always figure I would rather find a problem in a controlled setting than by myself.
https://www.mayoclinic.org/tests-procedures/nuclear-stress-test/about/pac-20385231
I received my heart transplant because my Heart would go into life threatening type arrhythmias, not the normal ones anyone can get like it mentions, and I had a pacemaker with defibulator to shock me back in rhythm. I'm saying this to realize your in pretty good shape as we are the same age. No meds and only asprin your doing great. So hang in their the information they find my find an easy problem to fix before more radical treatments are needed. I really hope this helps as I'm very familiar with anxiety and it's no fun. So when I used to get anxious I would tell myself, Sometimes out load alone in the car, to calm down. That actually worked like I'm ordering myself to calm down. Pretty funny don't you think. 🤣
Take care and if I can help further please ask.
🙌