YOU SAID:

I‘m not even kidding i bit my arm so hard i started internally bleeding

INTO JAPANESE

冗談じゃない腕を噛んで血が出てきた

BACK INTO ENGLISH

I'm not kidding. I bit my arm and it bled.

INTO JAPANESE

冗談じゃない腕を噛んで血が出た。

BACK INTO ENGLISH

I'm not kidding. I bit my arm and it bled.