What Causes Severe Abdominal Pain, Loose Stools With Blood After Taking Laxative?

Friday night I took a laxative, 2 Dulcolax. I woke up at 3:30 with severe abdominal pain and had to push to start the bowel movement. After I went 3-4 times with loose stools, there was blood in my stool for the next 4-5 stools. All the next day, I passed small amounts of blood all day, which stopped at night. The next day nothing. When I finally had another bowel movement, there was blood streaked on the outside of it and on the tissue. Today, there was less blood on the stool and nothing on the tissue. I had a colonoscopy 8 weeks ago with 2 polyps removed, mild diverticulosis, and hemorrhoids. Am I healing whatever the laxative did?