Hi Dear, Welcome to HCM. Understanding your concern. As per your query you have drowsiness and fatigue. Well there can be many reasons for symptoms you mention in query like middle ear infection , labyrinthitis , anxiety disorder , side-effect , food poisoning , irritable bowel syndrome or gastroenteritis. I would suggest you to eat light and non spicy , drink plenty of water take small and frequent meals , take antihistamine like benadryl twice a day and take antacid after every meal . Eat fresh fruits and vegetables to get minerals and vitamins. Consult general phycisian for proper examination . Doctor may order certain test like endoscopy , stool test and ultrasound . Doctor may prescribe omeprazole , antibiotic , immunosuppressants along with anti allergic . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari