J.P.
HI--
There are a few things you could try.
1. Often time reflux that doesn't seem to respond to treatment is caused by a hiatal hernia. This is when the stomach gets up under the diaphragm. It happens in babies because their stomach muscles aren't strong enough to keep the organs in place. It even happens in adults, usually due to stress. Our chiropractor taught us how to literally pull the stomach down to pull it back into place. I had to do it quite often with my youngest. He would start spitting up, I'd pull his stomach down and all symptoms would immediately go away. Eventually his muscles got stronger and we stopped having to do it.
2. Food allergy tests do not always show a sensitivity. An allergy is a histamine reaction (from the liver) whereas a sensitivity is caused by an inability to properly digest something. There are lots of things you could try. Aloe vera, catnip and fennel, slippery elm, and marshmallow root to calm the stomach and the inflammation. Probiotics to help calm the inflammation and assist in digestion. Food enzymes to help in digestion (they make chewable ones for kids). The most common sensitivities are to gluten and casein. Both are very difficult to digest. Also corn and soy. Unless organic, wheat, gluten and soy are genetically modified, which is being shown to cause liver damage.
3. Have you had him tested for H. Pylori helicobactor? That is the bacteria that causes ulcers. Our dog had it and I became a carrier, passing it to my youngest. He had stomach issues for his entire first year until I treated him for that (with mastic gum). Suddenly his stomach issues went away all together.
4. Has he been tested for systemic yeast infection? If he had thrush as a baby, or if he has ever had anti-biotics, it is likely that this could be the problem, or at least contributing to it.
I have used the alternative medicine approach with my kids because western medicine gave me the run around a lot like you are experiencing. No real answers or solutions. If it resonates with you, I would suggest finding a natural practitioner in your area (naturopath, chiropractor, acupuncturist, etc).
If you have questions about anything I've written, please don't hesitate to ask.
Good luck,
J.