THE LAB TECH WHEELS in her ultrasound machine as I lie in the hospital bed, ready to bare my chest. The hope is to know why, yesterday, my heart throttled up to 190 beats per minute and hovered there for over an hour like an angry hummingbird. I was at a journalism conference, surrounded by hundreds of people, many of whom I knew, not one of whom I asked for help. When the hummingbird threatened to fly away with my consciousness, I quietly called an Uber.
In the back seat
