My biggest IC problem, by far, is this - I go to the toilet, pee, fine. But then I have to sit there for nearly up to 10 minutes and do up to 10 more small streams. Even then when I get up from the toilet, I could go again but it would only be a dribble.
I got scanned for emptying my bladder and was told I could (saw for myself my full bladder on screen and saw it afterwards, with only 4cc left), though it was noted that I had to sit for a few minutes to full empty to it.