My daughter got extremely ill after eating at Sci-Fi diner on Jan 7th for lunch. She had the kids mac 'n cheese and a milkshake. About 5 hours later she wasn't feeling great and I took her back to the resort, and by 630pm she was projectile vomiting, which lasted quite a while, and also was going at the 'other end' too. I had to have housekeeping out to clean carpets and change bedding. I spent about $15 on meds from the gift shop (immodium, children's mylanta), and also called the Sci-Fi, and of course she claimed that no one else had been sick.
It came on too violently and fast for it to be a 'stomach bug' and I know it was food related. The next day we took a very slow day around Epcot, but she didn't eat much at all and was back in bed by about 630pm.