"butterflies in my stomach"?

蝴蝶在我的胃
Means that you are very nervous and restless.

To have (get) butterflies in your stomach means to feel very nervous about doing something.

For example:
before taking a job interview you might feel nervous and say, "I have butterflies in my stomach." A student who always feels nervous about giving an oral presentation to his classmates gets butterflies in his stomach.

butterflies in the stomach
n.
神經的发抖
可以解
一個人過度緊張!

忐忑不安，有些擔心