Hi naswm, sorry to hear you're feeling so low.
On days when I cant get going I try and do the following and they might help you, excuse me if I sound bossy, trying to do this before dd's next feed!
Go and wash your face with cold water. Put on a bit of slap, especially blusher, give yourself a healthy glow. Quick squirt of perfume and a clean t-shirt and you'll feel better about yourself (take kids with you if necc, how old are yours btw?)
If you can't face going out, go round and open the windows and let soem fresh air in
Get binbags and get the kids to help you if possible to round up all the washing. You don't need to do any of it but at least its all together, out of sight and ready when you feel up to tackling it.
Then have a cup of tea, coffee, lots of sugar
Go easy on yourself adn do beans on toast or something similar for tea
Think of something you know the kids like doing, even if just reading a story. Sit with them for a while and it always helps me to realise how much i do actually like them even if they've been doing my head in all day.
Don't knwo if thats of any use to you. I think you posted yesterday too about having a bad day? Do you have someone to turn to in RL? HAve you thought about going to the drs?
Gotta go, boobs tingling here!
Take care