YOU SAID:

I fallen and I can't get up

INTO JAPANESE

私は落ちたし、起きられない

BACK INTO ENGLISH

I fell and can not wake up

INTO JAPANESE

私は転んで起きられない

BACK INTO ENGLISH

I can not fall and get up

INTO JAPANESE

私は落ちて起きることはできません

BACK INTO ENGLISH

I can not fall down and get up

INTO JAPANESE

私は倒れて起きることはできません

BACK INTO ENGLISH

I can not fall down and get up