I noticed that this was posted since 2008 so I'm hoping your issue was resolved and you can share with me since I have a similar problem
-Feel like passing urine all the time
- As soon as I leave the toilet I feel like going back - my bladder never feelsl empty
-No burning experienced while urinating
-I can hold it for several hours if I wanted to(I have a full night's rest without having to go)
Took antibiotics treatment for a UTI but no improvement since then