I too was experiencing the same long covid symptoms with endless phlegm and nasal drip after recovering from my 2nd round of covid infection. My first round was March 2020 then again in Novemebr 2022. I never had allergies or any related seasonal issues my entire life so having this drip and thick mucus was all new to me. Found an interesting article about Cardamon and gave it try. After 3 weeks of steady cardamom tea I began to notice fewer and fewer instances of throat clearing and after the 4th week I haven't had any phlegm or nasal drips. Hopefully this method is helpful for others as it was for me. I can't remember any other time in my life that I drank that much tea to the point where I gave up my morning cup of coffee.