Oh Trazzle you are having such a rough time, I really hope next week will be better.
If dd feels better next week could she go to nursery on the Friday so you can be with Joe in hospital?
Sometimes if people cannot cope with the reality of life they bury themselves in work, not sure if your husband is doing this and of course it is no excuse, but he wouldn't be the first or last to do so. It is not always the case that they are men either, I recall that Nicola Horlick once mentioned in an interview that when her dd was so seriously ill with cancer she just worked and worked and worked whilst the nanny was with her daughter (in hospital I presume).
I would be outraged if my DH had done that at the time, but luckily enough he didn't so I didn't face your predicament. I feel for you though, this feeling that everything rests on your shoulders is the last thing you need/deserve.
I know it is almost impossible but do try not to put too much pressure on yourself to have everything perfect. Your kids would be most happy to be home with you and your DH at X-mas, that is the greatest gift to them. Of course, we are all very much hoping for many more Christmases for all of you but nobody can look into the future.
I hope your dd gets better soon and that Joe's tummy bug is short lived. I also hope that your DH sees some sense and gets his priorities right.
Lots of strength,
[Hugs]