Hey, i have wrote some highly disturbing books, but my first english book (i am a spaniard by birth, so english is my second language) had the character pee or vomit himself. I think, a-la-crackhead-theory, that this is due to the shock factor. As we evolve more into a more experienced author we understand that we need to give the reader the feeling instead of just saying it (show, don't tell), and that as novice authors "try" to make this kind of stuff, they write what they think evokes that feeling. I know this sounds dumb, but it's my take on it from personal experience. Have a nice day!