How is constipation managed in patients post pancreas surgery?

Hi,

I had partial pancreas removal ten years back, and I am on CREON for digestion, which I take accordingly. I have had mild IBS (diarrhea-type) symptoms for the past ten years. Usually, I have regular daily bowel movements. Five days ago, I was constipated for three days. So, I took Dulcolax two days ago. Now I have excessive flatulence, a bloated belly, and a lot of "noises" in my stomach. My diet has not changed. My appetite is normal and good. My current medication includes Atenolol, Pantoprazole, Escitalopram, Amlodipine, Crestor, Fenofibrate, and, as said, CREON for each meal. I have been taking these medicines for many years, no change in that. Two weeks ago, I went for a check for the pancreas and an MRI of the abdomen. The result was OK. Please help.