@pfarren Have you tried saline flushes of your sinuses? My sinus issues were thought to be an issue with my bronchiectasis. I don’t know if it’s available there, but Neil med has premixed packets for saline and I like their silicone Squeezie bottle since it can be boiled. I use these to keep everything as clean as possible.
My brother uses a Nettie pot and mixes his own solution. There are instructions on line to do this.
I also use nasal sprays. Ipratropium is the quickest acting I think, but I also have steroids and an antihistamine mixed in. . You could ask your PMD for help with sinuses until you get in to specialty care.