Stressing About Stress Test

I had my appointment with a cardiologist last week to obtain clearance for surgery. Although he said I do not have any current symptoms of coronary artery disease, because I have a number of risk factors (size, strong family history, diabetes, high cholesterol [though controlled with medication]), he wants me to do a stress test. I have the appointment on Thursday. Because I cannot walk for more than a couple of minutes at a time, they will be giving me medication to induce the stress.

I am getting nervous. I do not want to find out that I have coronary artery disease. My father died at 40, presumably from a heart attack, and I take after him in almost all ways health-wise. I guess it's better to know, but I am worried. The cardiologist also said that false positives are an issue with stress tests... hope it's right the first time.

Anyone have any experience or wisdom to share?