A Heartbreak.

It's agony. Complete, excruciating agony. It's like your heart has been ripped out of your chest and stomped on, and you can't breathe... you don't want to eat... you can't function. It's the most intense pain that you'll ever feel, and the worst part is, there's no way to relieve it. It's unyielding, merciless torture, and you know that it's yours for life.