:( Sorry to hear that, yes it is something going the rounds.
I'm a bit further down the country than Belfast in the border regions but it is doing the rounds locally here, I checked with GP surgery on phone yesterday.
Encouraging your DS to have a restful day and you to avoid it, also remember toilet seat down after flushing any D anyway so it's not hanging around the air, let some air in.
Hope this is over fast and general run is as PP said 48 hours, I'm getting a backlash from double antibiotics last week so not helping but sipping dilute, ice lollies at normal "mealtimes",
I plan on toast later and I've had some applesauce last night which caused rebellion, also diorlyte and bananas at the ready, I have started probiotic drinks x 3 times a day, as well as I, know my gut is in turmoil after all the antibiotics.
I have some broth in the fridge for when I'm more ready to eat but it's going to be very bland for days and let body recover.
for you and 
for your DS to cuddle