There's an old proverb: "Open yourself up for a good day and prepare yourself for a bad one."

In 2013 I began to feel increasingly sensitive to others BS, seasonal allergies, and flu. Had a bad flu in 2014 - 15 from X-mas eve for about 8 weeks. Was out of work - used up my abundant supply of sick days and vaca time. Point being I started a hermit thing. I believe I was toughing up for COVID. And did well during COVID including losing weight.

Since I turned 70 last year I feel very grateful for all I have.