welcome to HCM,
2 Year old child having high grade fever with vomiting ,loose motion
and occasional cough it suggest child having a gastro enteritis
,pharangitis or bronchitis
crossin drop in 2 year aged child is less effective than crossin syrup,but only crossin is not sufficient to treat the above condition at home you must consult a doctor in this condition.
I m advice you to put a cold water sponge over whole body and give syrup crossin 5 ml at the time of fever and plenty of liquid orally like lemon juice,tea coffie ,butter milk,coconut water etc to prevent dehydrtion from diarrhoea
as a home remedies