I suffered sinus inflammation for the last year. I started to take Bromelain in capsules, 2 per day, for the last 4 weeks and yes, it really helps at last.
Zero side effects so continue for another 2 or 3 months in the hope I can stop the inflammation. But it's important to change the diet completely. Zero sugar, flour and so on. No starchy foods, no fruit at all. And a good Cider vinegar daily + 2 stalks of fresh celery.