I started out with the phlegm aka "glonk" and now it has morphed into cough, tickle, clear throat five thousand times a day. My hair too had thinned since covid. I am so sorry for all you are going through. I am done with calling my doctor and doing tele-med. I have to learn to live with it but I don't have to like it! I eat a plant based diet, take fermented supplements, make my own quercetin and so far, nothing has worked. We now know what it is like for the millions of humans who suffer with chronic disorders for we now have one. I do believe we will heal, I just do not know when.