You look a little pale. Are you OK?

你看起来脸色不好，你没事吧？

To tell you the truth, I feel terrible. 

说实话，我感觉糟糕透了

Why? What's the matter？

为什么？怎么啦？

I have a horrible headache and sore throat. 

我头痛严重，嗓子痛

words:

pale    苍白的 

To tell you the truth    跟你说实话

terrible    可怕的 / 糟糕的

horrible  = terrible   可怕的 

headache    头痛

sore     痛的

throat    嗓子  / 咽喉

You look a little pale. Are you OK?

你看起来脸色不好，你没事吧？

To tell you the truth, I feel terrible.

说实话，我感觉糟糕透了

Why? What's the matter？

为什么？怎么啦？

I have a horrible headache and sore throat.

我头痛严重，嗓子痛