I interpret it more onto myself (even though i know why Amy wrote it) Every time i listen to it, i see a park for some reason, and i'm sitting on a swing. It starts raining ("rainclouds come to play, again") and i just continue swinging, even though i know i need to get away.
It's just like you know that you have to accept what has happened (be it death, heartache or whatever kind of pain that disrupts your world), but your heart still refuses to believe that it could be true. And eventually you wake up and see that your fear is real... totally sad.
XxAmyxX