What causes pain in the mid-left side?

I am 5 months post-op LAP/RNY and every once in a while, I will get a sharp, debilitating pain in my left side - above the hip but below the ribs. It has happened after eating and during exercise. It is so sharp and severe that I can't stand upright. I have found that sitting and bending over help alleviate the pain. It seems to last 30 minutes or so, then passes. Any ideas?

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