no there is no mental or physical health diagnostic label for using too much toilet paper. how much a person uses is pretty much one of those things that is different for everyone mental disordered or not.

that said there is a mental disorder where a persons symptom must have things a certain way or count things when ever they are doing anything including bathroom needs...its called OCD along with many other mental disorders that include ritualistic /repetitive behaviors like having to count.

mind you I am not saying the original poster or the person they are talking about is OCD or not just a general fact that some mental disorder do have the symptom of counting things.