My sinuses are the BANE of my existence. Always have been. I inherited shite ones from both my parents.
Invest in one of those facial steam thingies. When those first came out, I was positively gleeful! Not b/c I give myself facials, but b/c if you're good about keeping them clean, they are a godsend for chronic sinusitis.
3x/day. Add oils - tea tree is what I prefer for its antibiotic properties.