I've got bad body ache and diarrhea. is that food poisoning or gastric flu?

Gastroenteritis: Aches with nausea, vomiting and diarrhea suggest a viral gastroenteritis(intestinal flu) and usually runs its course in several days without specific treatment except rest,fluids and light diet. Food poisoning is also a possibility but fever and aches favor a diagnosis of a viral gastroenteritis. Kaopectate helps control diarrhea and Tylenol (acetaminophen) helps the aches.

Gastroenteritis: Most likely a viral gastroenteritis. Drink lots of clear fluids