Hi please help I'm going crazy . My daughter is 5 and 4months . She developed a very high fever since Monday morning , the strange now it's been 5days she still has has fever. But only during the evening and night and after giving her Tylenol the fever is broken in 1hour and nothing during the day , what could it be ? She is having a runny nose since yesterday only and before that it was only fever . Visited our GP he believes it's viral , should I be worried that the fever is continuing for so many days and the fact the is only comes back in the evening and at night ???