I also experienced burning, I was on a liquid/juice fast for first 4 days, then I did the Amaizing Liver Flush. I got the stones out and I can relate with your uncomfortable experience. I also had the burning sensation at the rectum. But I am sure its bcos of the toxic bile stones getting out. I took 2 times Enema. That helped a lot of my colon to be washed by water. Then I drank Watermelon juice, its not burning that anymore. I know it will pass.