What is the sharp, stabbing pain on left hand side of back?

All of a sudden I have sharp, stabbing pain in the middle, left hand side of my back. It is near my waist line(but in the back, and actual waist line not low cut jeans waist line). It comes and goes, when the stabbing part happens it feels like my entire mid section completely tenses up and it becomes hard to... show more All of a sudden I have sharp, stabbing pain in the middle, left hand side of my back. It is near my waist line(but in the back, and actual waist line not low cut jeans waist line). It comes and goes, when the stabbing part happens it feels like my entire mid section completely tenses up and it becomes hard to breathe. I have never experienced pain like this is my life. It is a 10 during the worst part. If I don't move the pain is still there but a throbbing. I'm starting to get scared.
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