Movies that absolutely destroy you?

I love watching movies that don't leave you alone after you've watched them. I finally watched Requiem for a Dream yesterday and it left me completely... I don't even have the words. It just wrecked me. And I'm looking for more of that. Not Requiem for a Dream in particular, just movies that are as gut-wrenching as this one is. I had a similar experience with Interstellar for example.