I had the same thing happen to me about 2 years ago, I'm now 73. I went to a heart specialist and a pulmonologist, and they all concluded 2 things, first my heart, arteries, and lungs are 100% clear, and they both said my stuff was that of a mid 30s person. So, I asked what the problem was, they think, after looking at my medical records, the situation I was experiencing was due to long term covid. But that leaves me scratching my beard, was it the covid, or was it the two Moderna shots I got? They won't tell me if it was the Moderna shots, just that it was from covid, they will never admit it was from the shots.

I ran into a person about this same subject, he had the same symptoms as I have, he's about my age, he never got Covid because he got the shots, hmmm.

I can't say what you're going through is that, but that's what happened to me for seemly the same experience.

But like others here have said, go to a SPECIALIST in heart and pulmonary.