Ditto to the spot on info and suggestion by Flycaster.
I certainly understand that your experience was positive, but we don't know what tests have been done, what the child's hx is and what could damage the LES valve or the upper valve. From what I understand about 2% of the population show a gluten problem, so it is possible. A similar percentage has LES valve damage, so that is also possible. There are literally hundreds of reasons for digestive issues. In my case, extreme vomiting caused by a blocked bowel destroyed my LES valve. Other people have gall bladder issues. A seven year old can certainly have a hx that might be the cause other than a single issue.
I strongly urge, Ravensmommy, to listen to the docs, have your child have the tests, and use us as support, but depend on the medical community, not health boards. Keep us informed, and best wishes.
Hmm, my reflux simply disappeared 24 hours after I quit gluten, and I take no drugs whatsoever. That's all it took to fix it.
In what condition can a 7-year old's esophagus be, except for brand new?
Generally an endoscopy shows the condition of the esophagus, and if any cells particularly above the LES valve show changes, which is a strong sign, as I understand, of acid reflux. The fact that the ph test shows problems certainly would be a reason to have an endoscopy. It is a procedure that won't do more than make your child pretty loopy, and will give a lot of information.
I'd ignore any suggestions of diet and drug additions or withdrawals, there are many reasons for GERD, etc. I'd precede with tests and listen to your doctors, and let us know what is found.
There's a possibility that it's caused by gluten intolerance. Just a possibility.
You can try cutting out all gluten and Prilosec for few days, and if that's his case, reflux will disappear.