I too, have had copious amounts of mucus for over four years since having Covid19 four times and received four vaccinations. I wake up at night and have to clear the mucus which continues throughout the day. The mucus color ranges from milky white to yellow to celery green. I use a sinus rinse and a prescription nasal spray. My PCM has ordered both lung and sinus xrays that show nothing out of the ordinary. Feeling frustrated!