under the weather
What's wrong with you?You look a little under the weather.
I was still feeling a bit under the weather.
B:I made a doctor's appointment for you.
A:No, I'm fine. I don't need to see a doctor.
B:Then I guess you're healthy enough to clean your room before school.
A:OK. I'll go to see the doctor.
B:Bundle up. It's wet and rainy out there. Here's some soup.
A:Chicken soup again?
B:Soup does the body good, sweetie. It's what you need when you're under the weather.