if he still has fever after 3 days, see doctor again.
use Telynol for enfant(last for 4 hours) during the day
and you can use advil or Motron 8 hours fever relief (for enfant)at night, so he can sleep well. This is what my kid's pediatritian told me.
breast feeding is the best. or if he refuses water, dilute the enfant formula a little bit, and gave him bottles very often.