Its Dr Gupta
since your child is two year and duration fever is of short d most of screening test seem to be normal ( CBC, Urine, CSF) .
but you have not mentioned about CRP .
with symptom and sign we can give only possibility of few disease
1 viral fever
get two investigation
malarial parasite , C-reactive protein
if these tests are negative
give only paracetomol orally . if fever did not resolve do hydrotherapy
give antiemetic . and wait to find out localised sign and symptom