This is the reason that sinusitis is so had to treat because everybody can have the same r different symptoms. everyone reacts differently to treatments. I hear u it does get tiring and frustation. I can not tell u what will help. As i have tried many different treatment in my battle with chronic sinusitis. But u r not alone.
There are other, similar posts on this site. If you read through them you find people suggest various things that they've found helpful over the years.
For me, I had chronic sinusitis for about a year, many years ago. I would get swellings above or below my eye and didn't where to put my head because of the pain. I was given repeated courses of antibiotics but it always came back.
Then my doctor suggested I tried inhaling the steam from menthol crystals disolved in boiling water. I did this several times a day, pain went, and very rarely now get blocked up after a cold.
I also, coincidentally, started taking evening primrose oil capsules for something else around the same time. A guy often posts on here saying that evening primrose cured his sinusitis. I certainly haven't had a problem since - and I still take it everyday as I believe it's really good for just about everything.