I have said that I did have a silent heart attack, meaning I have no clue when it happened, but I made jokes that it happened when I was shoveling snow and now maybe I wasn't joking. At the time DH worked away from home 2 weeks out and 2 in, and I would shovel enough to open the big gate so the guy who did our driveway could get in. I would shovel , stop and pant, then shovel some more eventually I would get enough shoveled to let the snow plow in