A patient arrives at the clinic complaining that he can’t take a deep breath and is having intermittent chest pain. He is taking glyburide 2.5mg daily, captopril 25mg twice a day, and HCTZ 25mg daily. He hasn’t taken the HCTZ for 2 weeks and is hoping to get his medication refilled. The physician wants to evaluate his congestive heart failure, ordering an ECG and a stress echocardiogram. As you’re explaining the test to the patient, he sounds concerned and fearful. Do you know how to respond