Hi Melodie,
I looked up Flomax and found this: "Blockade of these adrenoceptors can cause smooth muscles in the bladder neck and prostate to relax, resulting in an improvement in urine flow rate and a reduction in symptoms of BPH."
www.rxlist.com/cgi/generic/tamsul_cp.htm
I hope it helps, but if you have been having this retention for a long time with no other ill effects maybe it's not needed, unless some kind of symptoms are present that need treating . I'm not 100% sure about the risks involved with urinary retention, I do know that some people have it chronically and live quite well, while others get chronic infections....reflux into the kidneys would be a bad thing, I think.
I was upset on your behalf to read that your husband is not supportive of your treatment path. It's extremely difficult for a person to come to the point where any kind of cancer surgery is acceptable, and bladder removal is a big surgery. You will remain the same person afterwards, but it will take some months.
I certainly see your logic about being a cancer-friendly environment and wanting the organ removed. Chemo alone is not considered an adequate bladder-sparing treatment but an adjunct to the surgery which is the main treatment. I'm really sorry to hear that your husband doesn't understand this.
Maybe you should have him read our "memorials" to those who didn't survive their bladder cancer diagnoses....and you could remind him that women's prognoses are not as good as men's when it comes to invasive bladder cancer, and timely treatment is paramount to long term survival.
Take care,
Wendy