I'm a little under the weather.
You look sick. How are you feeling?
I'm as sick as a dog.
I'm a little under the weather.
I hope you get better soon.

我有点不舒服。
你看起来不太舒服。你感觉怎么样？
我病得很严重。
我有点不舒服。
我希望你很快好起来。