I Have Had Cramping For Five Day. I Had Diarrhea

I have had cramping for five day. I had diarrhea first day and started sweating really bad. I have had no mor diarreah but still cramp and have urgency to go about twice a day. Feel tired and generally unwell. There was a small amount of blood in a dark stool the second day. Have been eating oatmeal and eggs. I had a colonostomy about 4 months ago and it was fine. I am 76 years old. This may have nothing to do with it but I have started hiccuping a lot lately.