Talk to Pediatrician on Diarrhea, Weight Loss

My son is two years old. He had diarrhea for around 4-5 months. Since he travelled from Saudi Arabia to Pakistan, we thought it would be due to changes in the surroundings. We tried to changed his formula milk to Lactose Free in doubt that he might be lactose intorlent. His stomac is bloated and swollen like a ball. We used several kind of precsribed medicine but no effect recently we visited a doctor and he asked for some tests. I have attached the tests results. Kindly advice what is the problem and how it will be cured.