Firstly hun you DO NOT suck at this gig, your an amazing mum to two gorgeous spirited kids!

With Dd it could be an age thing, DD2 is starting to have melt downs about the smallest of things - the new phrase is "don't CRY just TRY" as she will constantly sook if she can't work something out the first go or if DD1 gets a shot at something before her.

I have no real advice about the sleep, you have had all the suggestions before with DD and i don't think there is much more i can suggest.
It's starting to warm up now and we could start walking again while DD1 is at kinder, maybe DS will enjoy the fresh air and have a nap and DD might enjoy Miss Z's company.

You know you are more than welcome to drop DD off for a day (even if your home with no plans) to come and have a play with the girls, i can grab the carseat and drop her off later in the arvo.
I'd happily do the same with DS if you think he would take some EBM or even in between feeds so you can have some Mummy & A time (cino at the cafe or something).

Here if you need anything hun, you definitely don't suck though.. your AMAZING!