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Yesterday my stomach started tightening up then releasing the tightening up then kept doing it over and over. It last like a minute each time and all this last for 15-20 mins! It hurt a lot! I don't know if that's normals or what it could be. Even when I would breath it would hurt when my stomach would expand. It was like a very sharp pain when it would tighten up! Has this happened to anyone...?