I usually hate how horrible it makes me I turn into a complete bitch and try to avoid going out anywhere. But sometimes DH has done something really annoying when I'm my usual calm self and I just let it go, but when I've got PMT I will tell him in no uncertain terms that he's annoyed me, and he listens. So sometimes it's a good thing as I can clear the air. Not that I'm saying my DH is awful or anything he isn't. I think I wouldn't like to be on the receiving end of it as he never knows if I'm going to be a screaming banshee or cry my eyes out over nothing. I also usually avoid mumsnet at that time for the same reasons I can't be rational.