Hi welcome to health care magic Your USG, x ray, thyroid report normal... So specific organic cause is not present. As having stomach pain since three month, rule out H.pylori gastritis by urea breath test and if positive antibiotic regimen given for that... Take pantoprazole tablet for two week... Avoid excess tea, coffee and spicy foods... Your problem is functional if h. Pylori negative... For that stress avoided... If needed fiber supplement can be given.. If still your symptoms worsening endoscopy is recommended Hope this will help With keeping this in mind consult physician Take care