What can be done for painful bowel movement with weight loss?

Hi,

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You mean you have noticed weight loss because you have lack of appetite. You cannot concentrate, you are feeling weak, cannot even get out of your bed. Your left side of body pains when you defecate, your abdomen pains. You have been having lose stool. If I got you right then you might have infectious diarrhea. Gastroenteritis or infectious diarrhea is a medical condition characterized by inflammation and infection caused by bacteria specially. The key treatment is get enough fluids (for mild to moderate case). Typically oral rehydration solution is best. More serious cases need patients to be admitted and get IV fluids. The other possibility could be of celiac disease, but proper diagnosis need investigation and third reason could be giardiasis. Again stool culture can give us diagnosis. Listening to you it looks like you are feeling very much sick. I will advice you to go to hospital and get examined. In between keep yourself very well hydrated. And visit hospital as soon as possible. Thank you and take care.