My daughter is 3 years old and still suffers from reflux. Have a look at RISA its an online support group that may be able to offer you support. I recently joined and it has already been great. It is extremely frustrating when doctors done believe you are brush you off. My daughter has had a barium meal swallow follow through done which is a test whch can show them refluxing. Its like an xray that is recorded at different intervals after drinking this white stuff. She has also had an endoscope which is a camera down her osophageous to look for possible causes and the severity too. My daughter was on losec and then nexium. If he has damage to his osophageous (which he prob does) then it will take a few weeks once he has started on the tablets to see their full effect as the damage has to heal first. I suggest you shop around for a supportive Paediatrician who can organise tests and referrals.