I have been experiencing constipation on/off for about 2 weeks. I am moving my bowels but not enough. I have a distended abdomen, lots of gas and stool is thinner and smaller than normal. I ve tried stool softeners, laxatives, and most recently I m trying to follow a very clean diet. I am healthy overall, exercise, and eat well. I have a good weight. I am getting worried that it may be something serious. I was supposed to have a colonoscopy (due to my age) but haven t had one.