When someone calls me "What's wrong with you?" How do I fight back so that I can get my words together?

I'm sick and you have medicine? Don't bother me if you don't have medicine, if you are talking about yourself, sorry I am not a vet so I don't have medicine for you, turn left in front of the mental hospital and go all the way!

My sister scolded me ""You have a disease ah I just so back to her (^3^)