YOU SAID:

i need to go to the bathroom, eat, then wash my face.

INTO JAPANESE

私はトイレに行き、食事をしてから顔を洗う必要があります。

BACK INTO ENGLISH

I have to go to the bathroom, eat and then wash my face.

INTO JAPANESE

私はトイレに行き、食事をしてから顔を洗わなければなりません。

BACK INTO ENGLISH

I have to go to the bathroom, eat and then wash my face.