Thank you for your quick response. I've reviewed all the comments and really appreciate this forum.
This happened following an upper respiratory infection, possibly Covid, although my test results were negative. However, I did experience a loss of taste and smell for over a week.

Initially, I suspected asthma, but I quickly realized it was unrelated. My primary care doctor, leaning towards asthma, prescribed steroids, which unfortunately made the SOB come on worse.

I then saw a pulmonologist who conducted a lung function test ruling out asthma, COPD, and other common respiratory issues. She couldn't definitively diagnose but suggested possibilities such as an allergic reaction or anxiety. I don't experience frequent anxiety, and the symptoms don't fluctuate. My sleep is fine, and mornings are generally symptom-free. The SOB tends to come on toward the day's end. Interestingly, two of my siblings have encountered similar issues—one persisting for years, while the other's symptoms went away after a few weeks.

I appreciate your insights. I'm currently seeking a specialist at a major hospital in Chicago, but my search has been somewhat challenging. Any suggestions for what type of specialist to see? From reading these forums it does appear that this does become more manageable which is good to hear..