Sickofit - hope you have been getting through the day all right.
Do you have some coping skills in relation to the kids that you can use now? Settling down in one room with snacks, bedding, books, toys and everyone piling on and mellowing out for a while? Having the kids doing whatever they can to help get the necessary stuff done. Smiles and praise for a job well done, thanks for their efforts. Nothing major, just small things they already know how to do.
Declare a "10 minutes extra love for mommy" time? There are a lot of things that kids are happy to do for us if we only ask. A "let's try out all our hugs on each other time"? Small reliefs can go a long way sometimes, esp when the stress is high. Everyone feels it. Let them try to rub your feet for you (if you're not too ticklish!).
Also, I find that I try to do too much for my (non-PTSD) husband and realize that it's my automatic setting.Letting go of even a few small things (like: he's perfectly happy to heat up his own lunch or eat cereal - if I just let him know) can give me some relief. I don't have to be responsible for everything, all the time. It's hard not to take on things that were never meant to be mine in the first place.
Thinking of you, hang in there.