Have you had the covid jab..... that would be it.
Only joking. Although this isn't a joking matter. I would ask for a 24 hour blood pressure monitor.
I am very fit active 41 yr old, also been active and on the top scale for fitness. Not long at turning 34 I thought I would die and now never take a little chest pain without seeking advice. It came on like a pulled chest muscle, as if I had done bench press for the first time. I had been cycling in sub zero temperatures and didn't eat straight afterwards. ( extreme activity can shut down immune system and eating can kick start it)
Pain went on for a further 4 days when I took the wife's advice. Was rushed through a&e. Ecg was raising alarm bells. A was alone on a bed when I got told I am having an heart attack and flying me to Cardiff. Luckily a consultant who shouldn't have been there saw the commotion and asked what was happening. He was able to confirm it was myocarditis, thankfully. Weeks of medication and tests continued to show something not right on the ecg. A trip to a larger hospital and further checks revealed that there were 2 partial blockages in the artery. A stent was fitted. If it wasn't for the myocarditis I would never have known, until it was too late.