Pixi, I'm totally with you babe. Before the DTs were at school, I spent so much time chanting to myself 'Do not wish this time away, you'll miss it when they're older,' through gritted teeth while being elbowed in the boob, screamed at and vomited on simultaneously.
I also had a screamer, and it pushes all the wrong buttons at the same time. I can cope with the nagging, the smearing, the stroppiness, and the constant tidying up, but screaming sends me into some kind of witch-like frenzy, where I want to tear something limb from limb and I have to keep my fists firmly clenched so I don't actually do it to the child in quesion. Even my DH is always taken aback by my reaction to it because I'm normally quite chilled about stuff, but I just can't handle it. And of course, the more worked up I get, the more he screams. Now that he's five those episodes are few and far between (normally just when he's tired or ill) and can often be halted by reference to his star chart (he has a column devoted to 'not screaming'!) or by reacting in the complete opposite way he wants me to (ie 'I'm sorry, DC, I can't hear you, can you scream a bit more please?) Of course it depends what mood I'm in and sometimes I still fall for it and get into the argument which then gives him justification for screaming at me .
Sorry, I'll stop talking about myself now. All I'm trying to say (as is the point of this thread...) is, no matter how sane everyone else seems to be in real life, on here you know you're not alone babe!