Hi welcome to health care magic... Here you are having constipation associated with problem in gastric digestion... This can lead to gas and back pain.. So treat constipation ...for that follow below advise... Avoid sedentary life style... Daily exercise done... Drink more water daily.... High fatty meal avoided.... Avocados rich in dietary fiber and help in healthy digestion... Red beet roots rich in fiber , pottasium etc...help in relieving constipation .. Fruits taken more... Avoid gas forming foods like...... -onion -turnip -cauliflower -cabbage Avoid stress... Smoking and alcohol kept very much restricted as they can lead bloating. Chamomile in green tea useful.... If still no relief psyllium with water or milk can be done .... If still problem USG done .... Take care. Dr.Parth