We started inhaled GSH specifically because the sinuses were starting to look inflamed...Polyps are an end result of inflammation. (Our Dr. trained as a ENT surgeon)

Some thoughts...Maybe the GSh has delayed polyps from forming? You use a mask for inhalations - right? Maybe even get another opinion for other ways to clear blockages before surgery now that you know what you are dealing with...maybe enzymes that breakdown mucous/ dead cells/ debris and are anti -inflammatory? Maybe a stronger solution nasal wash? along with some accupressure on the sinus points? You could do the therapy yourself once someone showed you what to do...Since traditional doctors don't use natural remedies they don't suggest them, but it doesn't mean they don't exist...

(For enzymes maybe research serrapeptidase or seaprose (mucolase). We use Enzymedica products - you could call them and see if they know a Dr./ND in your area who is familiar with enzyme therapy / sinus issues. "enzymedica.com" Mucostop or Serragold)