YOU SAID:

I had fallen through a trapdoor of depression

INTO JAPANESE

私はうつ病の落し戸に落ちていた

BACK INTO ENGLISH

I had fallen in the trapdoor of depression

INTO JAPANESE

うつ病の落し戸に落ちていた

BACK INTO ENGLISH

Had fallen to the trapdoor of depression

INTO JAPANESE

うつ病の落し戸に落ちていた

BACK INTO ENGLISH

Had fallen to the trapdoor of depression