YOU SAID:

because i feared his state was heightened

INTO JAPANESE

彼の状態が高まるのを恐れたので

BACK INTO ENGLISH

I was afraid that his condition would improve

INTO JAPANESE

彼の状態が改善するのではないかと心配しました

BACK INTO ENGLISH

I was worried that his condition would improve

INTO JAPANESE

彼の状態が良くなるのではないかと心配しました

BACK INTO ENGLISH

I was worried that his condition would improve