There are quite a few abreviations many of which I do not understand. However, I have/had similar problem to you.
I am 56 years old. I have a nasal defect caused at birth.
I had a nasal surgery in the 1980s but last year I had more nasal surgery which has made beathing easier.
For the last few years I have had a reduced urine flow which was solved last month with an incision to the bladder neck.
I have also had several general anathestics (GAs) for the above operations plus some for kidney stones (which indirectly is how my PC was diagnosed).
None of the GAs (except obviously the last one) affected how much urine I could pass.
For the bladder neck incision I was incontinent for only a couple of hours after which my bladder was able to cope with a wider neck.
From my experience I would recommend that you have the nasal operation. Yes it is a risk, but so is everything. I found that difficulty in beathing caused difficulty in sleeping and me using nasal sprays which the ENT specialist was extremely unhappy about.