I was medically cleared as OK at an urgent care center and also tested negative for COVID-19. Quickly after realizing that my symptoms were mind-body related, they ceased. For that reason, I do not believe my COVID test result was a false negative. My shortness of breath was usually present but at varying degrees. I also noticed how it had gotten worse while presenting, training, and leading new team members at work - I'm a social person and constant webinars (as opposed to in-person interactions) made it difficult to feel connected. I started putting two and two together. I just saw your reference to Dr. Schubiner and his work with long COVID patients - have you ever considered contacting him? He's typically very responsive via email!