Hi welcome to the health care magic As your USG and blood report normal aa per history, no organic cause present .. It could be from gastritis or from functional bowel problem If no mucus or blood stool present and if no fever present than no need for using antibiotic... For diarrhea you might prescribed racecadotril like antisecretory agent.. Along with pantoprazole like antacid also can be taken... Avoid stress, smoking and alcohol if having habit of it.... If USG suggest no kidney problem and no urinary complaint than no need to consult urologist If no improvement than stool culture and examination needed Consult nearby physician or gastroenterologist for your condition for examination with keeping all this in mind Take care