I have a small lump in my tummy halfway between belly button and ribcage, lower than the Xyphoid Process. I have had diarrhea for two weeks, and started vomiting black chunk two days ago. I dehydrated last week, went to the ER, they said I was dehydrated from the diarrhea, gave me a saline drip, said my blood work was fine, and sent me home. Nothing changed, other than the addition of the black vomiting. I almost fainted yesterday and called my GI as I have had polyps removed, and been hospitalized with chronic constipation. My GI referred me back to ER. They gave me another saline drip along with a prevacid drip, said my blood and urine tests were normal, my blood pressure was very low, and took a bowel specimen for testing and sent me home. OK, so I still don't know what is going on with my body and it still has not stopped. I am lost as to what to do from here.