Looking for suggestions

Looking for a new pediatrician for my 3 year old nonverbal son. We are wanting to try out leucovorin for him but his pediatrician wont prescribe it. Does anyone know of any pediatricians that specialize in autism? We live in marion county but are looking for something near huntsville, bevause we are plabning on relocating soon. He has medicaid so any suggestions will be greatly appreciated. Also, any recommendations for places to receive aba, speech and occupational therapy would be great. We have him on the wait list at the alabama autism center in decatur, but they said it can be up to a 2 year wait. Thanks so much!