Hello everyone,
thank you all so much for your thoughts and kind words, it means a lot to me! 
Monkey well done on 7 days, that is brilliant!
And Nellie sorry to hear about your day, I think keeping calm when they're lashing out at you is the most difficult thing as you feel under attack and instinctively you try to defend yourself. I remember once dd1 kicking me when pregnant with dd2 and I smacked her bottom as a reaction. I felt awful, but she was having a massive tantrum and kicking in the stomach and I just reacted instinctively.
We had a nice weekend, got a babysitter and went out on sat night for the first time in ageeees. It felt really good and I didn't even mind being woken up at 7 on sun morning with the usual whinging from dtd 'downdowndowndowndown'.
Sat morning dh also took did to let me have a lie in, which was lovely and much needed.
Spent most of Sunday outdoors and with neighbours so that was good too, kids exhausted last night and were in bed nice and early. Result. 
Now when dh is around I find the dts much easier to deal with as I don't have to spread myself in a million directions, BUT I now have problems with dd2 aaargh, who is 9 and a half and a mini teenager as well as suffering from middle child syndrome. We get a lot of tears and drama and I do try to be empathetic about it, with a lot of "I'm sorry x has happened, you feel this way etc etc" trying to make useful suggestions, which all end up being thrown back at me along the lines "I will NEVER EVER have time to do x again" despite me suggesting shall we do that in the week? Of course she will have masses of homework, the locusts will come, whatever, it os never going to happen. So, eventually I lose my cool, and end up shouting 
I have to admit, I haver always shouted, i remember having arguements with my sister and and when I'd run out of things to say, I'd resort to shouting, she would tell me, patronisingly, to stop shouting so I'd yell louder. I know dd2 is my mirror image, and I would like to give her the tools to control her temper, as she is the one losing out in the end, but she doesn't listen to my advise 
oh my this is very long!
Can I ask what are your strategies for not yelling when you are faced with the usual triggers?
Mine are:
the dts hitting/pushing each other and continuing to do so AFTER I have repeatedly said stop. (in those cases when I can't physically separate them immdiately i.e. I'm cooking)
when the dts just tip all their toy boxes on the floor without actually playing with anything, I know this is mostly attention seeking behavior and it happens when I'm busy doing something else, it still irritates me
total refusal to get coats/shoes on refusal to get in the car when needed. i try to give warnings and leave enough time, but on top of the refusal tehre's always a last minute nappy change/toy I have to get we can't possibly leave the house without/a drink/food, all times 2
oh and dd1 and dd2 arguing for the silliest things, but that would be a whole new thread! 