On his Facebook page, Mark Meuser for U.S. Senate on January 9, 2022 asked the question:

Who knows someone who was vaccinated and had a heart attack within 30 days?

Today, on his FB page, Meuser writes:  

One week ago I asked a simple question and I have received over 5,000 answers to that question. Go to the original post if you want to read personal testimonies of what happens when you allow one unelected bureaucrat to make health care decisions for everyone. 

I don't have a FB account, but I watched (and downloaded) a video on Telegram posted by BeachMilk/Scott13 showing a lengthy stream of horrifying answers in the affirmative (heart attacks and more) on Mesuer's page. The video lasts one minute and 49 seconds, which is kind of an eternity's worth of FB messages, but the video would have to run on much longer to show them all.

Here are a couple more screenshots: