I Have Had Diarrhea Now For 5 Days. Initially, I

I have had diarrhea now for 5 days. Initially, I thought it was a virus. For the past couple of days, I go 3-4 time each day after eating, The stools look like light colored sand. The last 2 movements have had pinkish blood in them. I am 57. Had colonoscopy at 50. All normal.