Your son seems to have throat infection. For fever you can give him plain paracetamol syrup with a gap of 6 hrs. Use Ibugesic plus (combination of ibuprofen and paracetamol) only for moderate to high grade temperature (>102 deg F).
Keep him well hydrated. Give him lukewarm water, clear soups, milk etc to drink. He should take sufficient rest. Betadine gargles will help.
Next Steps
Please get his throat examined by doctor once to determine if it's viral or bacterial infection. If it's bacterial, may require antibiotics.