Do u have any annual leave? Could u take a few days off to clear the backlog and set up some kind of system to get everything under control? Cool a stack of dinners for the freezer etc? Is it worthwhile looking at getting a cleaner once a fortnight? We pay $70 for 3 hrs a fortnight and it saves our sanity and gives us precious family time?
It's hard work juggling it all, best advice is work out what the non
Negotiables are and get them done and try not to fret about the rest.
With regard to the girls interrupting your sleep, would putting a matress in your room to give you all more room help?
A suggestion for the sleep issue- have you tried setting up a mattress on the floor of your girls room for you (not sure if they share a room or not though). I am the same- cant sleep with DD in our bed but DH has no such problem. Works better for us if I sleep on her floor and she is reassured when she wakes during the night. Usually takes about a week before she settles back into a decent sleeping pattern.
I agree with making a list for the other things, and maybe cutting back on swimming for a term?
Also, what about some counseling through your employers employee assistance programme? Being comm services, surely they have something available to you. It all sounds quite overwhelming at the moment.....
Hope things improve for you soon.
I've booked in some professional supervision.
Swimming is the only thing they do with other kids so would really like to keep it.
In regards to sleep - i just sleep in their room. I at least can get a few hours sleep that way. DD1 doesn't have a day sleep and DD2 very rarely does. Will work on getting more activity in I think.

Thanks for the responses. xx