YOU SAID:

somebody once told me my body would not work happily

INTO JAPANESE

誰かが私の体が幸せに働かないと私に言った

BACK INTO ENGLISH

Someone told me that my body would not work happily

INTO JAPANESE

誰かが私の体は幸せに働かないだろうと私に言った

BACK INTO ENGLISH

Someone told me that my body would not work happily