Do you have a follow up visit with your surgeon coming up? You may have developed an anal stricture (scar tissue) that needs to be dilated. I had that constipated feeling with frequent, non productive trips to the bathroom right after takedown. My stomach would get really bloated and make crazy loud noises. It was really uncomfortable like you are saying and that's what it was. A digital exam in the office would be able to tell. This is fairly common after takedown in the beginning and usually an easy fix. It's worth inquiring about. Hope you feel better soon.