pediatrician, neurologist
You can give paracetamol, but not more than 500 mg per day. These 500 mg you need to divide into 4 doses and give every 4 hours.
I advise you to call an ambulance to clarify the diagnosis.
Editorial comment
Most often, Ibuprofen-based antipyretic drugs (for example, Nurofen for children) give the fastest effect. Read more in the article about antipyretic drugs for children.