I have been diagnosed with Ulcerative colitis since 2005. I am taking apriso .375gms 4 a day and have been for a while. I am on vacation right now and am going through a weird thing right now were I can't eat at all. I am having constant bloody watery "diarrhea" with little black like sand particles. I also keepnthrowong up white fluidbwith little black sprinkles in it. I haven't been a bbn league to keep anything down...or up, I should say, so I really haven't been eating much for about a week now. Is this the colitis or is it a food poisoning or something else?