Hi... Welcome to healthcare magic ... According to your complain you have problem of constipation problem and oral lesion... After taking stool softner still you have constipation problem that do a abdominal ultra sonography for further diagnosis... Colonoscopy can done for further diagnosis... Intestinal obstruction may cause this type of symptoms... Thyroid problem may cause this type of symptoms... Irritable bowel syndrom may ruled out... Lack of water and fiber in diet lead to constipation.. Consult a gastroenterologist for further diagnosis.. Mention duration of the problem... According to oetiology start treatment... After oral examination diagnose can done ... Constipation cause oral ulcer problem most commonly. I hope my guidance helpful to you... Take care.. Thank you.