My grandson is staying with me while mom is out of town, he had a fever, headache, stomachache. He slept from 10:30 to 3:30. Very lethargic. I got him to drink some propel with electrolytes and put some Advil in it . I woke him up at 3:30 and bathed him off as he had wet his clothes with sweat, Fever is down and he at some grapes. His breath smelled like fish, not the normal sore throat smell. Should I just watch him or is there cause for concern?