Just noticed your post and thought Id share with you my experience.
I also suffered terribly from sinus problems. Constant sniffing, excessive mucous production, loss of smell, periodic sinus pressure pain during flight, blocked nose, etc etc etc.
Anyway, I finally had enough and went to a specialist about it. X Rays proved i
had polyps and i was booked in for surgery.
I was informed I would be having "keyhole surgery" that would be painless and non invasive. The operation took about 2 hours and I was released from hospital that evening after a few hours spent in a recovery ward.
Apart from the fact I was not allowed to blow my nose for a week, the whole experience was basically pain free, No bruising at all but there was some very minor swelling that went away quickly.
It was the best thing I have done without a doubt. The surgeon told me after the operation that he was very surprised by the size of the polyps so i am glad they are out!!
I couldnt fly for a month so i had to take a fair bit of leave.
After my time off, flying has never been better and I can categorically say it has definately improved my quality of life, so in a word, go for it!!
If u have any other questions, let me know
Cheers