YOU SAID:

I've been flabbergasted by this discovery

INTO JAPANESE

私はこの発見にあぜんとされてきた

BACK INTO ENGLISH

I found this stunned and has been

INTO JAPANESE

これは唖然し、されているを見つけた

BACK INTO ENGLISH

This is stunned, and then being found

INTO JAPANESE

これは唖然とし、発見されつつ

BACK INTO ENGLISH

This is stunned, and then being found