Hi. Thanks for your query. Noted the history and understood the concerns. If there is hyperacidity accompanied by LBM the probable cause can be gastroenteritis or IBS that is irritable bowel syndrome. Increase in acidity level on consuming ice tea or chocolate milk indicates that you have intolerance to the contents hence you have to stop these altogether for ever. Also take a PPI like Omeprazole, antacids and Domperidone if required as a motility regulator. Get the following investigations: Tests of stool, blood and urine. Upper GI Endoscopy. Colonoscopy. CT scan of the abdomen. If a diagnosis is found during these investigations get treated accordingly. If all the investigations are within normal limits, get a proper management for IBS, reduce the stress and anxiety which is the basic cause of IBS. Stop all the foods and beverages that you must have noted or will note in future those instigate or enhance the problems .