YOU SAID:

I have a headache and I have to pee and I need to buy things before the store closes.

INTO JAPANESE

頭痛がしておしっこをしなければならず、閉店前に物を買う必要があります。

BACK INTO ENGLISH

I have a headache and have to pee and buy things before the store closes.

INTO JAPANESE

私は頭痛がして、店が閉まる前におしっこをして物を買わなければなりません。

BACK INTO ENGLISH

I have a headache and have to pee and buy things before the store closes.