Suggest Remedy For Stomach Pain After Radiation Treatment

Had rectal colon cancer in 2013. Had chem. and my last radiation treatment was in January, 2014. That took care of the cancer and blood and scans with both oral and injected contrast of pelvis, abdomen and chest shows No Cancer. And that is wonderful, however pain in my abdomen and stomach continue. The pain starts about 15 mins. after I get out of bed and lasts almost all day. My oncol. dr.doesn t know what it is, only that it s not cancer. Don t know where what to do?