Radiation Colitis

Another question, sorry I recently ended up in hospital again, with severe stomach cramps, nausea etc, and after 5 days on Morphine etc, had a CT scan,an a colonoscopy. They finally decided that for a better want of a diagnosis they would call it radiation colitis (say the radiotheapy had caused a narrowing of the bowel,) and I was under no circumstance to allow myself to become constipated. Easier said than done. Has anyone else experienced the same symptons as the above or heard of radiation colitis before.