Hi Jemster
I've been watching this thread with interest, as you sounded a lot like me a couple of years ago. I have 2 DS - 7 and 5 now, but I found I just had to accept I wasn't supermum and as long as I had important things done like washing and dishes, and we were all still healthy at the end of the day, then we would all survive another day.
Now that they are both at school the days are a lot easier, and I won't say its perfect even yet, but its a lot better.
I wanted to give you some help on meals. I had got a lot of cook in the oven 1 pan meals off mumsnet, which really help, as you bung them in the oven and it gives you an hour free to concentrate on other things.
All the recipes feed 4 and are really tasty and are cooked at 200 oC)
Chicken roast - 1tbsp olive oil, 8 chicken thighs or drumsticks, 300g carrots, cut into rough chunks, 2 parsnips, (the same), 750g potatoes, cut into wedges, 1tbsp of honey, and 2tbsp of Worcestershire sauce. Bung it all into 1 large roasting tray and cook for about 50 mins.
One pan pork chops: 4 chops, 1/2tsp oil, 400g of new potatoes halved, 2 apples (cut into 8 wedges each), 150ml of veg. stock.
Brown chops in separate pan, put potatoes into large roasting tray, roast for 20mins, then add chops and apples and stock, and cook for 20 more mins. Serve with peas.
Sausage Tray bake - Put sausages, sliced red onion, sliced peppers, 1 bag of baby potatoes, tsp of mixed herbs and 1 tbsp of olive oil in large roasting tray for 1/2 hour. Throw in baby tomatoes, drizzle of balsamic vinegar, cook for another 10 mins and serve with garlic bread.
Hope this makes sense and helps a bit - will try and think of some more - and feel free to add any veg that suits you all