Just my twopence worth
Having had this year, both a flexable and ridgid cytoscopy (under a general anesthetic - day surgery), The only real problems are those already covered.
Astmatics can have problems (I'm one) - An indicator is an alergy to eggs.
I think the rate at which you recover is related to your general health and your age. No surprises here.
Remember its the emotional burden that really takes the life out of you. Waiting for the results is hard
If you are a professional pilot or engineer or other avaition person (i'm not) - I would imagine that your general quality of life and expectations; will see you through the process.
For me it was the good news that my symptoms were not bladder cancer, made the process worthwhile.
CAT III