My DD is nearly 12 and has what we call wobblers... ie, screaming/shouting fi/crying/slamming doors almost daily, it could be over something quite simple like asking her to do something, or if something goes wrong... now my point is that to us this is normal, but a friend made me smile when she said that sometimes her DD (same age) sometimes gets really cross, cries and stomps upstairs and slams her bedroom door...
So how often does your DD have wobblers and how do you deal with them...