Hi. Thanks for your query. Noted the history and understood the concerns. You have basically a problem of pain in abdomen on walking and you have not passed motion for the last three days. Pain on walking indicate that there is an inflammatory process going on in the abdomen which should be diagnosed by the following ways. CT scan of the abdomen. Tests of blood and stool when passed. If the fecoliths are present, you may need a soap-water enema and get evacuated. Once a primary diagnosis is done you may also need a colonoscopy to get a proper diagnosis. Once the diagnosis has been made the proper treatment accordingly can be planned. Till then continue the antibiotics and pain medications only if the pain is severe. Simple colitis can not cause so much severe pain without loose stools and mucus and/or blood hence the possibility of something else like diverticulitis or even cancer has to be ruled out.