Janani, what are the foods your child WILL eat? My brother has Autism, he is now 18, and has severe food allergies. He cannot tolerate dairy, casein, gluten, preservatives, artificial dyes, etc. When he was not on his new diet (we began at around 3 or 4) he craved foods he was allergic too. Of course, this is prob not the issue with your child, but worth a look maybe?
My mom believes I had PANDAS, because I had several strep throat cases very young which exacerbated (didn’t cause) my OCD. So, I do believe infections can change the brain.
Camel milk sounds interesting. Will do some research!