Hello I had gone through your question diligently and I will try to help you out in best possible way gas in abdomen and loose stools can be caused by food poisoning, gastroenteritis, colitis or worm infestation and intestinal hypermotility Apart from drugs Acid reflux can be manged with certain dietary and life style modifications like Avoid fatty fried spicy and junk food or carbonated drinks Have lots of fresh fruits and vegetables You can take curd, cold milk or fruit juices In my opinion you should consult your doctor for examination and stool test for ova cyst or parasite You may require a course of antibiotics like tinidazole or metronidazole and probiotics meanwhile try to observe good hygiene wash his hands with antiseptic soap or solution after using wash room give him plenty of fluids including ORS to avoid dehydration and electrolyte imbalances have lots of fresh fruits and vegetables or dietary fibers Hope this answers your question Best wishes