Good advice.
I know of no studies that link pilots with bladder cancer. You guys tend to live longer than Joe Average, probably 'cos you're from a better background, went to a good school, and are generally happy people. (Before I get any flack like last time, it's not the same as being stuck under a crane in a shipyard, trying to fix a gearbox at 7am is it?)
You are more likely to die of sun related cancers, but CA bladder isn't one of them.
From memory, I think there is a link between Aniline Dye products and this disease, there could be other chemical links. (You'd have to have a search on Medline for more detail.)
Maybe your medical checks pick up problems whilst treatable??? Which maybe skews the nurses way of thinking. (It doesn't take much!)
Good luck with the treatment, sounds like you've got things caught whilst the prognosis is good.