Well, I'm in California, and both my children have the 24 hour flu, one two days ago, vomiting and diarrhea, and the younger one today, but he just has diarrhea.
Sometimes stomach flu goes around, in The Spring. I am on Victrelis (15th shot today, and havent had a loose bowel movement, since I began, pretty much the opposite.
When I have had diarrhea in the past (which I HATE) I put myself on the BRAT diet, which is Bananas, (white)Rice, applesauce, and (dry white) Toast.