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What is this pain in my lower chest/stomach?

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Ever since this morning I have had a really painful pain in my lower chest/upper stomach. Here's were it all started I was spending the night at my friends last night and I sleeped weirdly, and then I switched spots to a different location were I slept on my stomach. When I woke up in the morning I had this really bad pain my ribcage area. It only hurts when I get up from a chair, and when I sit down. What could this be?:(