Hello Chronic constipation,abdominal pain,tiredness can be due to irritable bowel syndrome,inflammatory bowel disease or malignancy in intestine. If your constipation has lasted for more than 2-3 weeks,you need to visit gastroenterologist. Blood tests for thyroid,colonoscopy,USG abdo may be advised.Further management depends on the results of these tests. Calcium and iron supplements may also cause constipation.Talk about this with your physician. You may use over the counter mild stool softener like liquid paraffin,2 tsps ,for 3 days before going to bed. Drink warm water in morning. Consume 3-4 servings of vegetables and fruits.Include brans like oats in diet everyday. Hope this information helps. Thanks.