I Have A 8 Year Old Son That Does Not

i have a 8 year old son that does not feel when he has to take a BM, he does not smell it and he can not feel it when he did have a accident on himself, he is in counsling, we went to dr after dr for this and we even changed his diet... his counsler said she feels like he is no fully potty trained and we tried everything to potty train him and we have rewarded him and we even punished him and nothing is working. he is in a pull up now.. HELP what else can I do