What would the doctor do to help my 9 month old *if* he has the flu?

My older 4 kids have all been sick. Very much flu like symptoms, wet cough, runny nose, fatigue, fevers, etc. It has trickled down to baby. We are on day 2 of a fever, and he's been napping more and wanting to be held. He has been nursing fine and peeing and pooping.

Just curious how the doctor will help. We plan on going tomorrow.