Have you ever watched some painters while they paint- how they seem to stare down the piece as well as the subject and almost angrily take paint to the canvas. The artist throws himself mentally and physically into the act of creation. It's like that with writing too- it's an intense ordeal.
Writing is sometimes a stressful process for me. A rush of creativity can be exhilarating, but sometimes it can be frightening. I become so impatient to put the words down- or the words are impatient with me- that it drives me to an agitated state. I sometimes fear that the words are not right, as if the thoughts insist on being expressed with only the most accurate and perfect word. I perseverate on the search for the RIGHT word and if I can't find it, it's perturbing. In the end though, there is an immense satisfaction in what I have done that there is no rival to the feeling. I think I'm just in a rush to get to that feeling.