Ooh, my head hurts...

Gryffindor: Just wait until it's gone

Hufflepuff: Do you want some aspirin? I have some.

Ravenclaw: Drink more water and get some sleep, that's the best type of medicine. I'll get some candles for aromatherapy. 

Slytherin: *Prepares a bed for the person with headache and grabs a glass of water* This is why I told you to take care of yourself and no, you don't listen to me as always and look at you now, complaining that you have a headache.