@stanway I was in a room with three attendants and was closely monitored during and after the test. You can stop the test at any time. Just speak up. You will be asked if you are okay repeatedly. Of course, there is an EKG running and your BP will be taken frequently during the test.
My experience is that docs generally want to order every available test and then repeat them with some regularity. Big money. It can be overkill in my opinion. I would ask what about your care would change if the test results were poor. Surgery at your age? What, exactly? A change in meds? And how might the side effects of those meds negatively affect your quality of life. Good luck to you. It’s hard to stay on top of all this, isn’t it!