I’ve had brief, sharp chest pains right by the heart a few times a day for about a week and a half. I used to have them (at the same frequency) for many months. Then I saw a cardiologist, and my X-Ray and EKG came back excellent, and shortly thereafter they went away. But now they’re back. Which, of course, leads me to believe it’s partially in my head. But the pains are just so strong, so random, and so offputting that I’m scared. Is there any condition that could be missed by an EKG and X-ray?