我很怕打针！

Wǒ hěn pà dǎzhēn!

I am very scared of getting an injection.

医生帮我打针的时候，我非常紧张！

Yīshēng bāng wǒ dǎzhēn de shíhou, wǒ fēicháng jǐnzhāng!

I'm extremely nervous when the doctor helps give me an injection.

医生说要打针才会好。

Yīshēng shuō yào dǎzhēn cái huì hǎo.

The doctor said I will only get better if I get an injection.