I just discovered the netti pot (mine is actually a bottle) recently and can testify to its effectiveness. I buy little pre-mixed packets to put in the bottle so there is no worry about
too much or too little salt. Really important not to tilt your head forward or it will feel like when you get water in your nose while swimming. When I'm desperate I am very glad I have a steroid nasal spray to help
open things up so that I don't end up with a terrible headache. I hope you are feeling better soon.
I have Lyme; it doesn't have me.