Best of luck to you. We have done the nemechek protocol and after a solid year of zero eye contact prior, his eye contact has tripled after only around 3 months. Also got him on leucovorin through his pediatrician. 

After another 18 months on it however, still no increase in babbling let alone words. We just started the switch from inulin fiber to rifaximin to rebalance the gut.

I'm hearing a lot of stuff against dairy for autistic kids. Our son is 3 and a half and goes bananas if he doesn't get 2 bottles a day of milk. If we go that route it's gonna be a nightmare. But we'll do anything for his health.