diagnoses

Hi friends,  my son had his assessment On tues we was there for 2 and half hours,  they told me we could be looking at asd, and now have put him for genetic blood tests, I always new that my son was different as he is my 4th child and is so different, but the trouble I'm having is the not knowing if he has or not, it's hard to come to terms with some thing that you don't know what it is,  has anyone got any advice for parent's that have not got a full diagnosis thankyou all sarwillow