YOU SAID:

i have a big headache and it oh my god it hurts

INTO JAPANESE

ひどい頭痛がして、ああ、なんてことだ、痛い。

BACK INTO ENGLISH

I have a really bad headache and I'm like, oh my god, it hurts.

INTO JAPANESE

頭痛がひどくて、ああ、痛い、という感じです。

BACK INTO ENGLISH

My headache is so bad that I'm like, oh, it hurts.

INTO JAPANESE

頭痛がひどくて、ああ、痛い、という感じです。

BACK INTO ENGLISH

My headache is so bad that I'm like, oh, it hurts.