Am I clear in thinking the cleaning you do for the church is voluntary i.e. not paid employment?
Also "8am-5pm Mon-Fri, 10:30pm-7am Fri & Sat".. do you mean you finish work at 5pm Fridays, then go back out for a 10.30pm start and work until Saturday morning at 7am or is that a typo?
There's a few things to clear up but from what I can tell any normal person would find the above hard to manage with - you need to start paring down anything which isn't absolutely needed for your family's survival and be ruthless about cutting some of it down to reclaim some of your time. E.g. I went through a mini tantrum when we both started back fulltime (so less time than I'd been used to for sorting kids, housework around paid work), I found that I was the one driving a lot of the chores that I was getting stressed about.
Some examples off the top of my head:
I don't iron anything other than shirts, which H does when he does his. Sure, the bedsheets are wrinkled and perhaps my clothes don't have that lovely pressed feeling, but doing 4hrs of ironing every week meant it was 4 hrs less for doing the really much more important stuff like cleaning the bathroom or taking the kids to the park.
I also cut out some of the meals that were taking too much faff to prepare - told you I was ruthless!
A great excuse to cut out some of the regular crap from the diet too. Salads can be literally thrown together with a tin of tuna on very busy nights, and fruit is a lovely dessert. We eat a lot of salad in this house! Also batch cooking at the weekends makes life much easier.
I'm sure someone else will come up with better tips, e.g. more flylady stuff but those give you a start on what to look for - maybe another tip is to learn to say No to things if some people are asking favours of you, like minding their kids after school regularly, or dropping them off somewhere - learn to avoid people who are time vampires! the same goes for school volunteering stuff - i could cope with this when i was part time but i felt very guilty when i went back fulltime.... saying no... so i didn't, ended up running myself ragged. I've cut back on all that stuff, because i've had to. it's just life 