My son got stomach virus the last 2 times I took him to DL (just me and him, and he is an adult with special needs). Last time was February, and I got violently ill BOARDING the plane, had to leave the plane, literally losing my breakfast, and book a hotel room and fly home the next day (to east coast). It was scary as it was just me and him, and I had fever and could barely think straight. (DS needs complete care and supervision.) We had no luggage either, that went on to NJ without us. What a disaster. But at least we got to see the parks, except for the 2 days that he was sick.
I ended up in Celebration ER one trip to WDW, after being in room for 2 days barely able to move (severe bursitis attack, pain a 10 out of 10). I think I could only roll with these problems because we go to the parks 2-3X a year, it would be awful if it happened on a once in 5 year type trip.