I have had this problem since early 2022 with constant congestion and mucus in my throat.

The pulmonologist said that he sees this in many patients resulting from covid. The duration is indefinite, from going away after a few months to ongoing for years. There has not been post-covid research nor has there been enough time for research to offer any solution.

This affects my oxygen absorption and has left me with asthmatic bronchial spasms. My daily routine includes warm compresses in the morning, sinus rinse, antihistamine, Tylenol, cough syrup, pursed lip breathing and oxygen supplement as needed.

From reading comments on this site, I will look into NAC.

I thank everyone who is willing to share their experience.