YOU SAID:

I’m bored and my head hurts due to my brother

INTO JAPANESE

私は退屈で、弟のせいで頭が痛い

BACK INTO ENGLISH

I'm bored and my head hurts because of my brother.

INTO JAPANESE

私は退屈で、兄のせいで頭が痛い。

BACK INTO ENGLISH

I'm bored and my head hurts because of my brother.