When I find myself ready to scream, I've found that an activity that involves applying violence helps immensely. I'm not suggesting you go out and start a brawl, but a 60 lb punching bag, a trip to the batting cages, or a trip to the shooting range has helped me immensely. Barring that, sic a babysitter on the kids go for a hike or at least get away from people for a couple of hours. Leave the cell phone at home or at least, turn it off.