Three and a half years ago I was in a hospital room, admitted after several fruitless hours in the emergency room, where they could not diagnose the source of the stabbing pain in my back, the ache in my arms, the cold sweat, and the choking sense of dread and foreboding pinning me to the bed.
An EKG was normal. Ultrasound, normal. CT scan, normal. X-ray, normal. The only sign of trouble was elevated troponin levels (an enzyme secreted when your heart is in distress) on my blood test.