I have ever since I was a kid - I called it "getting a smell stuck in my nose" I still get this from time to time - generally it is something unpleasant, but liveable with, and indescribable. Sometimes it really bothers me - really really - most of the time it is just noticeable not horrible

Sometimes I get motion sick first (dont even have to be moving?? but I get it) THEN I get the smell

Sometimes I just get the smell

Sometimes I get the smell AND get nauseated