我不告诉你是因为不想让你难受。

Wǒ bù gàosu nǐ shì yīnwèi bù xiǎng ràng nǐ nánshòu.

I didn't tell you because I didn't want to make you feel unwell.

今天我有点儿难受。

Jīntiān wǒ yǒudiǎnr nánshòu.

I feel a bit uncomfortable today.

他被伤害了两次，实在是太难受了。

Tā bèi shānghài le liǎng cì, shízài shì tài nánshòu le.

He has been hurt twice, it's really too difficult to bear.