YOU SAID:

I just sneezed really quietly and someone said “bless you” really quietly because they weren’t sure if I sneezed, and I said “thank you” really quietly because I wasn’t sure if they said “bless you.”

INTO JAPANESE

本当に静かにくしゃみだけと誰かが言った「祝福」本当に静かにくしゃみ、本当に「ありがとう」を言った場合に確認されていないので静かに彼らは言ったかどうか分からなかったので「祝福」

BACK INTO ENGLISH

Really quietly just sneezing and someone said "blessed" really quiet sneeze, really not knowing whether or not they said quietly so not sure if you said "thank you" to "bless"