What happen Physically to the body during heart break.?

I am not talking about how your body feels (trust me i know what that feel like) im talking about why your body feels resembling that. What chemicals and stuff causes this. And why is it almost like a "high" to feel doomed to failure during heartbreak for example i get satisfaction out of making myself feel worse by thinking roughly speaking the person more, and by completly stop eating.
Answers:
Read that website
http://en.wikipedia.org/wiki/Heartbreak

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