I was going to say stress, too.

In any case, this one I learned from being a mommy: The BRAT diet is the best thing to get back in tummy shape after a bout of gastro. BRAT, as in, banana, rice, apple sauce and toast.

And stay away from dairy until you are completely okay! Diary, such as the yummy tasty cheese, will only compound the symptoms of GI upset.

Get better soon!