Thank you so much for your lovely messages, and for your support over last weeks meltdown. I thought I would post a quick update.
I did speak with my DDs the following evening, I intended to apologise for my behaviour, but actually decided not too, as I didn't want them to think I had been in the wrong, as it would give them a way out.
I explained why I did what I did, how I felt etc, and told them it was not good enough and they need to help out much much more around the house. They agreed that they had been lazy and understood why I did it.
We sat together and drew up a rota of chores for the week, with each of us getting an equal share of these. We picked our days according to whatever else we had going on, so they were quite involved in the process. Chores included cleaning living room, bathrooms, making dinner, emptying dishwasher, folding clothes.
It's been a week, and so far, so good. DDs have had allocated days for making dinner, and they make it in pairs. So they also need to discuss and decide ahead of time what they will be making, so I can make sure we have ingredients in. I do hover in the background, to guide them, but they are cooking on their days, even if its oven food, or pasta. They are also emptying the dishwasher (my least favourite job!), cleaning bathrooms etc on their allocated days.
I think the rota helps as its pinned to the fridge and is there in black and white, so they can't complain that they are doing more than their sisters are.
What has made the biggest difference has been that I went in super hard with their phones. I have an app so I can monitor their phone use - I banned their phones for the week, unlocking only between 2.30-3.30pm when they are on their way home from school. Time-sucking apps and games are banned completely for now, only WhatsApp and phone calls allowed in that hour.
They complained a lot about the phone restrictions for the first few days, I told them they are in place for a week and we will discuss again tomorrow, and they are not to whinge again or its be another week before I review. So tomorrow we will change it to 1h phone use per day, but not restricted time slots, they can use that hour whenever they want to - they like to message friends before school about last minute school things, so thats fine by me. They also need to be in bedrooms asleep/reading by 8pm, or its another 10 mins off their phone time.
I have also had words with myself - evenings are never a good time for me, so house stuff and nagging needs to happen earlier in the day and not later when I am always tired and at the end of my daily tether.
It's only been one week, but I have seen a change. Looking back I think this has been a slow slippery downhill slope and I am also to blame for not keeping on at them. Hoping this makes a long-term difference.
It helped SO much knowing that my behaviour was not unreasonable, so many, many thanks for your lovely messages, its so nice to get support and not feel alone in this. It's been a much better week. 