Hi All, I went into the hospial last week with this problem. First time ever. I don't drink and never had a problem before. Pain in my upper left side for a week and I finally went into the ER were they emitted me. They put me on fluids only for 2 days and did an endoscopy, a CAT scan and Xrays. The hospital's gastro doctor said he thinks it was stomach acid from my GERD causing it. They sent me home. But they sent me home with no real answers as to what the problem was and why, and no information about after care. Now today, I can feel that pain coming back again and I am scared. I don't know what to do for myself.