Thank you for your query,
you can give Tylenol
syrup in prescribed dosage and for cough you can give cough syrup with expectorant after consulting your Pediatrician
Whenever child gets fever or sick from any problem their appetite will go down and once the problem is treated their appetite will increase.
Give plenty of oral fluids, dietary fiber
rich foods like vegetables, fruits as the fiber will retain water in stool and make it soft and bulky for easy passage of stool.
Hope i have answered your query.