this may be some viral illness that should subside on its own within few days.
its alright to give crocin syrup if the child has fever, antibiotics should be started only if indicated, eas ache can be there due to Upper respiratory infection
which is mostly viral.
best you can do is to get your child evaluated by your pediatrician
who would be in a better position to assess the need of any antibiotics and antiemetics.
hope you are guided well with my answer
wish your child a rapid recovery
Dr. Amit Kumar