Tips that helped me at that stage (and I was far from perfect!)
Stick a wash on first thing in the morning. That gives you all day to at some point hang it on the line/drape it over radiators or stick it in the dryer if you have one.
Always have about three mega easy dinners in the cupboard or freezer for days when it's all too much. For DC that was tinned spaghetti with grated cheese and frozen peas. For DH and me, packet tortelloni that cooks in 1 min and jar of pesto. Or fish fingers/chicken goujons and oven chips. never ever feel guilty about this food. Kids love it, it's no effort and you're not well.
As often as you can, go home via the park. You get to sit on a bench in fresh air. They get to charge around/play with mates. You feel good that they've had fresh air and exercise. So do they. It means no one feels bad if the rest of the night's spent on X box/TV. If there's anyone you like talking to around, fine, but no need to stress about being a popular mum. Just let DC let off steam.
Big baskets/storage units. Toys in one. Things from school/for school in another.
Do a 5 minute room rescue (Flylady technique) each night. Set timer for 5 mins. Chuck papers/ junk mail in recycling box. Hang up coats and book bags, pair shoes, put dirty washing in basket or machine. Have a basket for stuff that needs to go upstairs. Wipe table/plump up cushions. It's amazing how much you can do in 5 mins. It looks so much better. You can do a 5 min room reduce for kitchen, sitting room, hallway etc - whenever you want.
Have endless supplies of baby wipes/household wipes. Use them for floors, chairs, mirrors, furniture, school uniform, faces, underarms, bums, wiping toys clean, sticky fingers etc.
Today:
made Dh birthday breakfast
went for walk with friend
walked into next village
volunteered at food bank
went grocery shopping
walked back
took DH out for birthday lunch
Tidied kitchen
Still need to:
prep lesson for tonight
cook birthday cake
teach lesson tonight
Knackered now but at least I've walked about 5 miles already today.V overweight and need to!