I'm with you OP. It is such a minor thing but when it's unrelenting it really gets you down!
I recently started using a syringe to squirt cooled boiled water with salt dissolved in it. You can get a product specifically for this (neti pot or something?). It feels freaking weird but it does help.
Also - boiled water in a bowl, squeeze a Karvol capsule into it, put a thick towel over your head/the bowl, and close your mouth so the steam has to go up your nose. I always hated being made to do this as a child but have recently gone back to doing it as it really helps. Have tissues nearby as it is quite surprising how much falls out of your nose