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No it isnt bad. Flu
symptoms reach and peak in 24- 48 hrs and finally decline gradually. Pain behind eyeballs , headache are common symptoms of flu. Sweating is seen , when fever
goes down, its bodys mechanism to lower temperature. Sleeiness and fatigue
is your bodys demand for rest.
If new symptoms appear or fever is seen again, you can visit a physician. Meanwhile - take rest, verylight meals, lots of fluids (water, juice, milk) (not coffee, tea etc), pain killers (if needed).