YOU SAID:

I had lunch but felt bad and left

INTO JAPANESE

私は昼食を食べたが、気分が悪くて去った

BACK INTO ENGLISH

I ate lunch, but I felt sick and left.

INTO JAPANESE

私は昼食を食べましたが、気分が悪くて立ち去りました。

BACK INTO ENGLISH

I ate lunch, but I felt sick and walked away.

INTO JAPANESE

私は昼食を食べましたが、気分が悪くて立ち去りました。

BACK INTO ENGLISH

I ate lunch, but I felt sick and walked away.