My husband, 75 yrs. old, has been nauseated with prolonged stomach pain for 2 1/2 days. Very llethargic, doesn't want much food or liquid. Had a small bowel movement today, normal urination. His stomach hurts very badly almost all the time. He has been in the recliner for since his complaints started. Should he be concerned. He is usually a very active, strong person--still working at several jobs; hardly ever sick. Any suggestions?