My experience with a Moderna COVID-19 vaccination differed: I developed sternal discomfort afterwards. My Internist's Attending said to take a daily baby aspirin until they could sort this out. I soon began feeling air hunger, so after about a week of it I dragged myself to the E.R. I was sent home following a work-up, after being told by the E.R. Attending to discontinue my medications. I stayed on the one prescription I take and discontinued the aspirin. The air hunger completely disappeared the day after discontinuing aspirin.

I recall back to the hospital ward clerk days I had worked while attending an adjacent college, when a patient presented with a adverse medication reaction that is what they did. The doctors discontinued every medication that they could. This may be ingrained in their training to do. In my case just the addition of a baby aspirin seems to have exacerbated my problem.

Although the original Internist advice hadn't helped matters this time, I strongly believe that the Internist is an integral part of all healthcare. My older sister too developed a drug problem which she was given Benadryl for. It turned out she is allergic to Benadryl!
Hopefully a good Internist has been overseeing all your testing, and will prove more helpful in sorting things out this year. Wish you all the best.