Your request sent off an alarm for me. Reflux plus resistance often equals food allergy. This is commonly missed by doctors, but I have seen it repeatedly. I am an occupational therapist for children and deal with oral defensiveness, and I am the mother of 2 children with food allergies. My youngest has had a lot of resistance to any new foods, and it only improved as we removed things from his diet that triggered a response. Both of my younger two were diagnosed with reflux, too. I have seen it in practice, too, that kids resist new foods until the allergens are removed. Unfortunately, the foods kids crave are usually the ones that they are allergic to. Milk and wheat are the two biggest ones which cause problems that are not always identified.
Allergy testing sometimes provides answers, but the scratch testing that is commonly done only identifies one type of allergy and often not food problems. You may try researching how to do a single food elimination diet or rotation diet to see what happens. There is information available on the web or in books like "Is This Your Child?" by Doris Rapp.
If it is not allergy related, but please explore this completely before deciding against it, you should find that getting your child to touch food, tolerate it on his plate, kiss it, put it in his mouth for a moment, take a bite, etc in a gradual fashion will often help to desensitize. You can also try dipping foods in a favorite condiment to increase his tolerance. Don't be limited by what you think would taste good. You'd be amazed at what ranch or fruit dip will do for expanding choices even if you turn up your nose. Once this improves, you can generally fade out the dip. Also, brushing with a vibrating toothbrush, including the cheeks and lips sometimes helps with defensiveness.
I am a 34 year old mother of 8, 5, and 3 year olds who works part time as a pediatric occupational therapist.
K.