You seen a doctor? They may be able to help. They have humidifiers built into them. Maybe they have some drops or something.
Folks,,,, I’ve tried everything! This has been going on non-stop for over 50 years. Very narrow bridge. Constant post-nasal drip.. And I mean constant. 50 year ago, doc wanted to poke a hot wire up there to open up the sinus cavities. He had done that for my Father. Freaked teenage me out!