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What could cause pain on left side from rib cage all the way to hip and around to lower back and nausea after? - what could be causing back pain on the left side

During the last week I had this pain in my left side, from my chest all the way goes to the top of the hip and at the side to the lower back makes me hungry, but if I do I eat immediately after a nasty and dizzy, no matter if I eat biscuits or. I have loose stools, the peas are. Has anyone else this problem or knows what it is? Your drivig crazy!