YOU SAID:

i don't quite remember what's gotten into me

INTO JAPANESE

私に何が入ったのかよく覚えていない

BACK INTO ENGLISH

I do not remember what got in me well

INTO JAPANESE

私は私によく入ったことを覚えていません

BACK INTO ENGLISH

I do not remember having entered well in me

INTO JAPANESE

私がよく入ったのを覚えていません

BACK INTO ENGLISH

I do not remember getting in often

INTO JAPANESE

私はよく入るのを覚えていません

BACK INTO ENGLISH

I do not remember getting in often