@anrw2018 have you ever tried using a neti pot? Here is some information about it if you are not familiar: https://www.mayoclinic.org/diseases-conditions/common-cold/expert-answers/neti-pot/faq-20058305

I had the same feeling you are explaining with my last pregnancy and this helped me considerably, especially since taking medications wasn't a route I wanted to go down. I also have several friends with allergies who swear by daily, sometimes 2x daily, use to relieve symptoms.

Have you heard of or tried a neti pot?