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As his current body temperature is very high so you should do cold sponging either with cool water or tepid water on his forehead,legs and arms.
Give him Motrin and Tylenol alternately every 4-6 hourly.
Hydrate him with plenty of fluids and Oral rehydration solution.
For cough,he can do saline gargles and take Robitussin DM.
Start a multivitamin containing B complex.
Elevate his head while sleeping.
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