Seansk, I just noticed that your post mentioned a "dominant side". My irritation is on the right, and I'm left-handed. I have to wonder if the others have a hand-nostril correlation? After all, the...
Note to Purrman, Your situation sounds exactly like mine, except mine's in the right nostril (I'm left handed?). Especially when you say the CPAP helps it (mine does) and going outside in cold air...