i am not sure if this applies to you op bc it might depend on whether you are more worried about vomiting yourself or having to cope with others doing it.
For yourself:
I know this doesn’t sound very reassuring, but if you do get it, although it’s unpleasant, it’s a lot less anxiety inducing than thinking you might get it ifyswim!
It’s a bit like the very nervous period before exams; you feel better once you can crack on with them, however dire they are!
For others:
The key is being prepared!
Large sick bowls inserted in to generous sized bin bags with clumping cat litter or sanitary towels or kitchen roll in the bottom to absorb liquid so you can literally just close and double knot the bags and dispose. Have a few made up ready.
A box of surgical gloves
As others have said, make beds in layers with plastic sheets so in the event of an accident, you can whip one layer off. Old towels over old pillows.
Dettol wipe door handles, light switches, loo, sink, all taps etc
Keep washing your hands!
In the event of sickness in others, Vicks smeared just inside the nose works well to prevent yourself being nauseated by the smell. Also buy a packet of alcohol wipes from chemist and inhale those. It works!
Remember you are not wrong to be upset and anxious bc there is nothing worse than your dc being ill but you are allowed to handle it in your own way and don’t feel you have to be strong man. Breathe.
Stomach bugs are distressing bc of the unexpected nature of them. Try and distract yourself with podcasts and try to look at the situation from afar to put it in to perspective. This is a really unpleasant phase but it won’t last long and you will be fine! And it will build up your son’s immune system!
Bumble through the best you can just like the rest of us! 😃. Humour and swearing under your breath is your friend! As is a wee nip of whisky once everyone is safely in bed! Good luck!