YOU SAID:
I have a terrible headache.
INTO JAPANESE
激しい頭痛がする。
BACK INTO ENGLISH
I have a severe headache.
INTO JAPANESE
頭痛がひどい。
BACK INTO ENGLISH
My headache is terrible.
INTO JAPANESE
私の頭痛はひどいです。
BACK INTO ENGLISH
My headache is terrible.
You should move to Japan!