Grammar PSA: This (below) is a wringer. Before electric clothes dryers, you'd wash your clothes, then put them through this to remove excess water before hanging them to dry. As you can imagine, your clothes look awful and wrinkled after squeezing them like that, which is why everything needed to be ironed back in the day.

So if you've had a really hard time and you feel worn out and flattened, you've been "put through the wringer," not "put through the ringer."