The causes of Dull abdominal pain
, excessive burps in the morning, motions immediately after food, slight fever and sluggishness can be an Intestinal infecion or Typhoid or an organic problem like appendicitis
Since you are getting proper response with Ofloxacin , Ornidazole Pantocid and Nutrolin B , please continue to complete the course.
You may get a cure.
If the problem persists, you may need upper GI endoscopy and Colonoscopy
and other tests of blood , urine and stool.