Thanks for your post mr. ed. Very educational and lessons are a good reminder for stubborn ol' me. Now I feel compelled to fess up.
At age 47 (some years ago), I had to quit right in the middle of a table tennis game in a tournament. I hit a wall of exhaustion like never before and was sweating profusely and white like a ghost. I was so mad that I caused my partner and I to settle for 3rd place rather than trying to go all the way to the top. When I laid down in bed that night, elephant on my chest, so I slept in the RV chair for the night. It took me 24 hours for people to convince me to see a doctor. Finally I went to urgent care nearby, and doc sent me straight to ER. Congestive heart failure attack.
When I heard the pre-attack symptoms, I realized I'd been having them for a few years!! Stubborn, ignoring, stupid me!