I haven't read all of the other posts (no time, being a working mum too!

)
My advice is to sort work around what you can afford and what you can manage time wise. I would prefer to work 3 days (8 to 4) but the home loan says no

, DH and my boss wanted me to come back to 5 days full time, I'm compromising with 4 days and make sure I spend my Friday doing stuff with Caitlin. You just need to make sure that the time you spend with Maddie is quality time.
As for work, do you HAVE to do what you're doing now? Perhaps a new career where you can have hours that suit better?
We'll all have to PM Emma and get her to set us up a Working Mums Support section. I've been back at work for just on a year now and still find it hard to juggle Caitlin, work, housework etc.