You don't look so good.
I have a major stomachache
Did you eat something strange?
I had spaghetti with clam sauce for lunch.
Maybe you have food poisoning.
Yes, that could have been it, but I haven't been feeling that great for the past few days.
Are you under a lot of stress?
Not really. Things have been going OK.
Maybe you have a touch of the flu.
I think that I might be getting the flu.