"Get well, soon!" "I hope you feel better, soon!" "I'm sorry you are sick, I hope that you feel better quickly."

a lot of people use "get well soon"

"You are sick." OK joking aside, if you want to wish him well, then say "get well soon".

Ask him how long he's got to live.

oh no Alexandra... very cruel ... by the way I'm talking to you from a Alexandria city \\__\*_*/__// \ / "" ""