I actually have had this issue since 2007. It's like I got sick and it never went away. 2021 got COVID in August and ever since my nose gets stopped up on one side every night constantly. I can't stand this. So I decided to try some homemade elderberry syrup that a lady locally makes and sells. It contains local wildflower honey and star anise, cinnamon, ginger and I forget what all but I finally got a little relief from it. You might want to try some yourself.