Hi Bicycling Architect,
Welcome to the forum. A few observations.
1. I trust you don't have a pacemaker, although reading your post I would say no.
2. When adrenaline is released, it would not be uncommon to feel it in your chest. The heart indeed at least feels like it's the center of emotions.
3. I found this researching your question, it may be of some help.health.clevelandclinic.org/2012/08/three-types-of-chest-pain-that-wont-kill-you/
"But if you’re a normal person, you often feel fleeting aches and pains in the chest area. According to Cleveland Clinic cardiologist Curtis Rimmerman, MD, writing in his book “The Cleveland Clinic Guide to Heart Attacks,” the following symptoms are unlikely to signal a heart attack:
Momentary chest discomfort, often characterized as a lightning bolt or electrical shock...."
Seems to be the same info provided by Kitt, but you now have the link as well.
Please visit the link for more specific information. Nevertheless, you have done the proper thing consulting your doctor, please continue to do if so instructed or if you continue to have concerns. I've been suffering from a benign arrhythmia for 40 years, and have participated on heart rhythm forums for years, I have never heard of a rhythm issue causing that sensation.