YOU SAID:

You too have a headache,my for school 3rd

INTO JAPANESE

あなたも頭痛がしています、私は学校にいます3日

BACK INTO ENGLISH

You also have a headache, I am in school for 3 days

INTO JAPANESE

頭痛がします、私は3日間学校にいます

BACK INTO ENGLISH

I have a headache, I have been in school for 3 days

INTO JAPANESE

頭痛がします。私は3日間学校に通っています

BACK INTO ENGLISH

I have a headache. I go to school for 3 days

INTO JAPANESE

頭痛がします。私は3日間学校に行きます

BACK INTO ENGLISH

I have a headache. I go to school for 3 days