It could be a stomach virus as it sure is going around. How long after you came back from Disney did it start? Did you eat anything unusual that might have given you food poisoning?
If your stools were light green after the Imodium, well taking it on a very empty stomach might be the reason, as Imodium is light green.
For now I would stay on as bland a diet as possible, yes toast, crackers, bananas and applesauce and also keep hydrated with either Gatorade or even gingerale, as with all that Diarrhea your probably still a bit dehydrated. If your not feeling better in another day or so call your Dr. to be sure it is just a virus.
Feel better soon....JJ...