Hi Michael and welcome, I hope your operation was successful regarding the cancer, As my cancer was locally advanced prostate, surgery was not an option, so had HT and  RT plus a TURP. Michael i too had  an overactive bladder, daytime i pee'd for about a second a time so it was always uncomfortable and to hold on for a hour was rare, often going 3 to 5 times a hour and was getting up at night up to 10 times, this is not to worry you . just to let you know where i started from. Michael there is no quick fix i wish there was. pelvic floor exercises are good, but don't think more is better 5 x 10 seconds 6 x a day is enough. bladder training, when you need to go just try to hold it in, it wont be long at first but will improve, PS if you can do this in the  bathroom it will improve your confidence to try harder, i also did pilates which strengthens the muscles in your lower abdomen,the inner core as they like to call it. As i also have bowl and bladder cancer i still do these today as i really benefit from them. I'm sure you have been told, no caffeine, alcohol or fizzy drinks and plenty of water and it is very good advice, as is to avoid spicy and acidic foods. Michael like i said earlier it will take time, I have bladder, bowl, anal and prostate cancer and it took me 5 months to get to where my bladder and bowls are seldom an issue, i would be lying if i said they were perfect, but it's been many weeks since they made me change my plans, i hope this helps, please take care, Eddie