So happy to hear that the cromolyn nasal spray recommendation put you on this track. I will now follow your lead and try the Cromolyn oral solution. I am currently still using the nasal spray as well as Claritin and Zantac 360 for H1 and H2 blockade. I will change to Zyrtec which is a stronger H1 blocker. Phlegm symptoms have improved but still present. My phlegm is also much worse after eating so I eat a very small breakfast and lunch so I can make it through the day talking to patients. I will also see an allergist. I have seen a long covid specialist with pulm background who also had not heard of this phlegm issue after covid.

You may find this article interesting which connects long covid with mast cell activation.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10166245/
I hope I have the same 80% improvement you have experienced and we can all get back to just enjoying life.

Peter