YOU SAID:

I was walking down the street and then I tripped and I fell on my head ouch

INTO JAPANESE

通りを歩いていたらつまずいて頭が痛くなった

BACK INTO ENGLISH

I stumbled on the street and had a headache

INTO JAPANESE

通りでつまずいて頭痛がした

BACK INTO ENGLISH

I stumbled on the street and had a headache