welcome to the wonderful world of having to go to the toilet, but not sure how to point!

we just went through that. If you know ANYONE else that you've been in contact with that has it; it is likely the norovirus that has them quarantining prisons in California, closing schools in Seattle, and which knocked out 3 generations of our family in 4 days.

The norovirus (which antibiotics do not even annoy) usually comes with a fever, but not always, and is infectious for 3 days after the first "outbreak"
I had it; the good news for you is that you will probably lose weight. It took me 3 days to be able to eat a normal meal and feel hungry. Part of that was the fever. But I am still weak, and i was hit on wednesday morning. DH is not going on his 50 mile ride today because he's still weak too and he got it on monday.
PLENTY of liquids and take something for the fever.

And if it's foodpoisoning, drink plenty of liquids.

for either one, take imodium for diarrhea if it continues too long.

and of course, call your doctor. I did.