After gallbladder removal I now have more frequent urination?

Milk may be part of your problem. It's true that it has some nutrients in it, but most of those nutrients aren't in a state that humans can properly digest. Especially the casein which is a type of protein-milk has 20 times more of it than humans can properly digest, as a result people can experience a great multitude of health problems. So for a sensitive, healing bladder the milk may be too hard on it.