I'm in the middle of my education about supplements and nutrition in regards to inflammation. I have in the past gleaned a lot of information from the forum The Truth in Medicine here at Curezone. I'd go over to that forum and search within it for inflammation. I think you'll find some very good information.
Your son really has a severe case of celiac! That is indeed scary. I don't think you are dealing with a long term case of costo though, and I'm sure if you resolve the inflamamtion, the costo will be resolved as well. You have his youth on your side. The human body is an amazing thing.