Out of interest, Do you use the Treetabs ?

Waterfox. Just the right spot between stock ff and modifications. I’ve tried zen and floorp but it’s waterfox for me.

Happy to hear that :)

Im not sure if I understood everything or if someone mentioned this already but since the Neti pot already was mentioned I think this may fit.

I always inhalate the steam of a pot of hot, almost boiling water, with salt dissolved in it with a towel over the head for sinus induced headaches. This is usually my goto method for these problems because it moisturizes the sinuses. Get well soon!

Something like this: