I have had thick sticky saliva since Covid that will not go away. It gets in the back of my throat and wakes me up at night. I've been to 5 different doctors about it. One cultured my mouth and it came back normal. They are baffled. I notice that if I eat pizza its worse, acid, sodium or dairy maybe? It's worse in the mornings when I get up. It's like foam. I have to scrape my tongue several times a day and rinse with mouth wash and I spit all day long. They call it hypersalivation. I've never had this until Covid. I am also taking a mucus thinner and drinking plenty of water which helps some. Antihistamines help to dry it up some, but, that dries my eyes out which are already dry. Is yours anything like this at all? Praying for you.