The pain in the stomach area with a bump-like thing appearing, as you mention, can be due to severe acidity, ulcers in the stomach, or irritable bowel disease. Since food particles like lettuce, peas, etc., are coming out undigested there is likely a problem in the upper gut, either the stomach or the small intestine. It could also be a malabsorption syndrome which can be seen in intestinal tuberculosis, HIV, tropical sprue, parasites in the stool and Whipple’s Disease.
A confirmed diagnosis cannot be made over the internet, nor is it possible to prescribe a treatment. Discuss these possibilities with your doctor and you may need to consult a gastroenterologist for this.
Hope this helps. Take care!
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