Gluten and casein free helps a LOT, but it’s not a magic bullet, which causes people to stop it unneccessarily. My son improved a lot on it, but he is still autistic and diagnosed as “moderately retarded.” I have no doubt that he would be much worse were he not on the diet, though. He went from being mostly non-verbal to speaking in complete sentences and being able to read and write somewhat.
That's a substantial improvement. Did you observe any improvements in self control along with the improved verbal and reading/writing skills?
Check out the above book. There are additional things beyond the gluten and casein restriction that might be helpful. I was reading it for background on the gluten issues when I picked up on the casein connection. There is more info to be gleaned, but it didn't seem pertinent to my specific interest at the time.
I'm gluten and casein intolerant and definitely seem to be affected by the opoid-like peptides in gluten and casein (get severe brain fog, anxiety, etc.) and just recently found out that eggs and spinach have these opoid-like peptides as well:
"It has also been documented that when certain food proteins such as gluten, casein, egg protein and spinach protein are broken down, opioid peptides are formed. These peptides mimick the effects of morphine, and those who are unable to break them down will experience mental illness."
http://www.bio-medicine.org/biology-definition/Peptide/
I'd wondered why I still occassionally got brain fog when I was pretty certain I wasn't getting any gluten or casein. I had already stopped eating eggs, but did eat spinach occassionally. I've now stopped eating spinach as well, and haven't had the brain fog since.
Is your son off eggs and spinach also? Perhaps going off those might help him improve even more?