Food Safety Report: Subway.

My hubby has had diarrhea and all flu like symptoms for 3 days. We ate the same food except he had ranch on his. Not entirely sure if its food poisoning but all signs are pointing to that. i have fed him rice, oatmeal, bananas and have kept him in plenty of fluids. symptoms seem to diminish n then all of the sudden its jus gotten worse......his stool is acid like and burning.what should we do? | Symptoms: Diarrhea, Nausea, Fever