I've had a bad few days too. I'm trying to "stay in the moment". Your post brings back so many bad memories for me.
I've camped out in hospitals for extended periods. I don't really want to see another Newborn Intensive Care Unit again - ever. It took a big toll on me and that was when I was younger and had a lot of gas in the tank. And before anxiety and depression took hold. If fact ... it was a big contributor to the original depression.
I finally came to this - "if I can't stay functional I can't help anyone else - and I'll end up being part of the problem". Is there any way you can turn off all the expectations - coulds, shoulds, needs to, oughts etc etc for now and that you'll just sort that out when the hospital stay is over? Just my experience, but you'll probably need 6 - 8 hrs away from the hospital to stay centered. After a couple of days - go to a movie. Just sit there and decompress. I've found that after an hour the stresses fade some and some optimism returns.
If the kids fight - that is a tough one. My daughter uses a confrontational tone with my wife all the time - and it sends my anxiety thru the roof.
Please take enough breaks to stay centered. Give yourself permission to do it.
Guess I can't do much but send a virtual ((hug)). You're not really alone if others are thinking of you.
Lyme, anxitey, depression, chronic C. Pnuemoniae
"... expect the unexpected ..." (O. Wilde)
"I am an old man and have known a great many troubles, but most of them never happened." (Mark Twain)