Sons diagnosis

Hi I'm totally knew to all this even soeakingn to other parents whos child may possibly also recently have been diagnosed wits ASD this is something I have worked with for a few years at local residential school and something I have always thought my son archie who is 3 now has had just early signs I picked up such as delayed development rocking head banging lack of eye contact with me my partner continually told me I was being a drama queen nothing wrong with him but eventually I got a diagnosis of autism 9 December 2015 and since then I have really struggled not so much accepting it just taking it in feel like I am totally heartbroken and that sounds so selfish but as much as I saw IT coming my heart conotably aching with worry of Archie's future in education his furture without me and his dad it all seems so much is this grief feeling normal ?  

E x