Have had headache, diarrhea, off and on vomiting for three

Patient : Have had headache, diarrhea, off and on vomiting for three weeks not fever. The last six days I have had bad cramping and gurgling a lot,especially after eating. No real gas passed, some belching but does not relieve it. Some dizziness, and yesterday I had half of my stool brown and then there was these chunks of almost black pieces mixed in ( tarry like). Then today I only had black (kind of a dark dark ash color). I have drank a little grape pedialyte mixed with a little grape juice for the dehydration but haven't had any since last night. I have never had grape juice do this to my stool, and have only had a 20 oz container of the pedialyte since Monday. The thing that makes me wonder about going to the ER is when it was only half and half yesterday, can food dye do that? I would assume it would "dye" the whole thing? I have a barium xray of upper GI on Tuesday and catscan. Doctor is out of town, but I don't want to go to the ER unless its actually a real emergency, any help would be greatly appreciated, sorry for the novel
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