What are the other problems your kid has along with fever?
Does he have cough/ running nose/ loose stools/ vomiting/ urinary problems?
Since its almost 6th day of the illness, its better that you have him seen by a Pediatrician
If there is any focus of infection seen, the doctor will prescribe appropriate antibiotics.
If needed the doctor might ask you to go for basic blood tests.
Before knowing the exact focus of infection, its not advisable to give antibiotics.
Also check the dosage of Paracetamol
before you give. It must be 15mg /kg/dose repeated every 6 hrs in a day. If inadequate doses are given, fever might not come down.
And unless there is a wheeze, its better to avoid nebulisations too. All fevers need not be associated with wheeze.
Hope my answer helps you.
Wish a speedy recovery for your kid.