我觉得浑身无力。

I feel weak.

youdao

有一天，我在书店里打工时，突然觉得一阵腹痛，浑身无力，大汗像冰雹似的落地有声。

One day while I was working in the bookstore, I felt a sudden sharp pain in my abdomen, became very weak and began sweating profusely.

youdao