YOU SAID:

I'm going to have a seizure I don't know what you mean

INTO JAPANESE

発作が起きるよ 何を言っているのか分からない

BACK INTO ENGLISH

I'm having a seizure. I don't know what you're talking about.

INTO JAPANESE

発作が起きています。何を言っているのか分かりません。

BACK INTO ENGLISH

He's having a seizure. I don't know what he's saying.

INTO JAPANESE

彼は発作を起こしている。何を言っているのか分からない。

BACK INTO ENGLISH

He's having a seizure. I don't know what he's saying.