YOU SAID:

I had to use the restroom

INTO JAPANESE

私はトイレを使わなければならなかった

BACK INTO ENGLISH

I had to use the bathroom.

INTO JAPANESE

トイレに行きたい

BACK INTO ENGLISH

I gotta go to the bathroom.

INTO JAPANESE

ちょっとトイレ

BACK INTO ENGLISH

I gotta go to the bathroom.