go through the mill
US /ɡoʊ θruː ðə mɪl/
UK /ɡoʊ θruː ðə mɪl/

1.
to experience a difficult or unpleasant period of time, often involving hard work or suffering
:
•
He really went through the mill during his first year at the company.
•
After the divorce, she went through the mill emotionally.