YOU SAID:

dont worry about a thing

INTO JAPANESE

事を心配いけません

BACK INTO ENGLISH

Do not worry about a thing

INTO JAPANESE

何一つ心配しないでください

BACK INTO ENGLISH

Please do not worry about anything

INTO JAPANESE

何も心配しないでください

BACK INTO ENGLISH

Anything please do not worry

INTO JAPANESE

何も心配しないでください

BACK INTO ENGLISH

Anything please do not worry