I'm so sorry to hear that. I hear that quite often from friends and family members. I did not get vaccinated/boosted around this timeframe if you were curious if that was the cause. I even had covid earlier in january 2021. I did a few COVID tests(both ER & at home) and came back negative each time. Inflammation markers in blood work also looked normal according to doctors/cardiologist.

For my situation, I think it was a combination of many things. Stress, anxiety, caffeine, intense workouts, allergy season, diet, hydration, long COVID, seasonal flu, genetics, etc. Nothing really changed for me personally either, but the world around me did. Maybe it's my body & mind's way of saying "dude slow down". So I listened.