Ah, the joys of radiation. As mentioned, gets lots of fiber, everyday. For example, I eat FiberOne cereal every morning. Try and get 100% of the recommended daily intake of fiber, everyday. I started using moisturized wipes during radiation. I look back and wonder why I had not done that all my life. I am never going back. Also, your doctor can prescribe a suppository or steroid-type ointment that can help in the short term. It should get better. Take care.
SC