My Husband Is Sick. He Thinks It Is The Flu.

My husband is sick. He thinks it is the flu. I think not because: started last week. Extreme body aches last week. Now, he is vomiting and cant keep any food down. Only water & diet 7 up stays down. He has extreme diarrhea. No energy. He says he is very weak. My husband is 6'5" 240lbs. takes rx for high blood pressure. He has not taken a sick day from work in over 15 years.