YOU SAID:
“I had fallen through a trapdoor of depression”
INTO JAPANESE
「うつ病の落し戸を落ちていた」
BACK INTO ENGLISH
"The trapdoor of depression had fallen.
INTO JAPANESE
「うつ病の落し戸に落ちていた。
BACK INTO ENGLISH
"Had fallen on the trapdoor of depression.
INTO JAPANESE
「うつ病の落し戸に落ちていた。
BACK INTO ENGLISH
"Had fallen on the trapdoor of depression.
That didn't even make that much sense in English.