I'm suffering from incredibly painful chest pain... what's wrong?

Since about Sunday, I've been suffering from horrendous chest pain. On Sunday, it was minor, and right in the middle of my ribs, so I thought it as nothing.

Today, it started minor, and then evolved into a huge pain. It's now situated on the left side of my chest, right above my breast. It hurts to breathe in, and to cough and burp

I'm going in tomorrow, but does anyone have any ideas to what's happening to me?
I'm suffering from incredibly painful chest pain... what's wrong?
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