I have known people to quit smoking and then have bronchitis or other irritations as their body gets used to not smoking. In the end all of this should calm down. I would avoid foods that cause inflammation, such as sugary drinks and dairy. Instead try almond milk or other nondairy milk. Also try drnking hot tea with mint as it is an antiinflammatory. Also eat lots of vegetables and greens for the same reason. Chicken soup may be soothing. Hang in there. I do not think you need to keep seeing the doctor unless symptoms continue after another 3 weeks or get worse or include fever or something more serious.
Did I read correctly that you symptoms started after you quit smoking? No, I now remember you quit only 2 months ago, and you've had these symptoms and nasal polyps for a couple of years.
Not smoking is good regardless, so keep that up. Do you have any nasal congestion to go along with what you posted?
Sorry I'm just thinking of things I'd ask if we were talking, I really don't have any ideas given you are already seeing doctors. This makes me doubt anyone reading you post will come up with something your doctors overlooked.
I checked one of your posts as a duplicate and it may be removed for that reason. If I was mistaken you may want to make that post again but make change it so that it doesn't look like a duplicate.