Your body is still getting used to the lack of nicotine; this may be one reason you are snapping at people. It's a common thing in withdrawal from any drug, irritability and short tempers. I agree with Rohag that you need to look into a stress reducer. Have you ever tried progressive muscle relaxation? Once you get the hang of it, you can really make your body relax, even without the dark room and soft music. PM me if you want some directions on how to get started on this.