Sorry you’re suffering; any stomach bug is no fun. I’m sure whatever you picked up was on DL property, but was just as likely to originate from surfaces, handles, switches, levers, and, of course, serving utensils. Norovirus is rampant this time of year as people in the Northern Hemisphere spend more time indoors.
I had a similar thing last winter that started 12 hours after a baptism pot luck. I strongly think it was because I ate with my hands after serving myself, without handwashing or Purell in between (I’m always paranoid in SCs). In that case it lasted <24 hours, just in time for me to fly to Europe.
Get well and keep up those electrolytes!