Do a self-test for allergies, including delayed and hidden allergies.
It's called Dr. Cocoa's pulse test. It takes about a week to complete. Free public domain, just search for it.
This saved me from having repeat surgeries every 4-5 years to remove polyps caused by "unknown "allergies, from both nostrils.
The surgeon said impossible to determine this, even with a biopsy. Yeah, right.
I just don't listen to that medical horse ****
Sinus infections, sleep apnea, funny smells and my quality of life had deteriorated terribly until
I had the surgery.
After doing the test twice, it was conclusive for allergy to pork.
This was about 15 years ago and naturally, I have been avoiding pork products totally!
You could try the test and stay away from any offensive foods, drinks, substances and see if the cysts diminish on their own. If not you may need the surgery.
The Flonase to my opinion just suppresses the symptoms on the surface, without much effectiveness in the long run.
Do you have your tonsils still? It sounds like you have a lot of swelling in your ENT system so I wouldn't be surprised if it was tonsil stones. They smell awful, and doctors will tell you they're harmless, but they can actually cause problems. Get rid of your tonsils and you get rid of the stones.