Sorry to hear the meds aren't working yet. I have sensitive bladder rather than incontinence so I can say for me it eliminates my daytime feelings of having to find a toilet...I can go out all day and be fine. However, at night I get up 3 times so maybe its about being prone in bed.
As to the post polio, we live in St. Simon's Island, GA. I think maybe my sister is a little better but she works so hard at her mobility! She swims and does pilates as much as she's able. She uses a cane and has an ankle brace and that gets her around the house and short spurts. Other wise its scooter or walker. She has back pain and I think gets shots a few times a year. I don't believe she has bladder issues from polio. Who is your physiatrist, I'm not familiar with that type of dr.