has anyone ever gone private?

hello, i am new to this...

my son had his ados assessment last week and did not get a diagnosis which i disagree with as does his nursery teacher. 

i have been so upset as he has so many symptoms and the assessor said his gut feeling was that he was asd but my son smiled, showed gestures. 

i am going to get a second opinion but also the option of going private. 

has anyone gone private and still get the care as recieved on nhs? 

thank you in advance