Developmental Pediatrician Appointment

After 5 years of waiting lists I will finally have my son properly evaluated by a developmental pediatrician! We are not going to the place I have been on a waiting list for, but still we have an appointment in September of 2014!! 
The first thing I am going to ask them do is give us a documented Autism Spectrum Disorder diagnosis. The psychologist who initially diagnosed my son did not provide any medical reports, only a 2 paragraph letter stating she diagnosed my child with ASD and a recommendation that we apply for SSI. 
I am also going to ask for the neurologist referral. I may not get the referral, but asking won't hurt. Given the family medical history I am pretty confident they will want me to explore the option.
I know I am not going to have all of my questions answered, but I am going to make sure a few are answered! Honestly my main concern is the behavioral "issues" and the educational anxiety. I am so sick of teachers telling me my child struggles with anxiety. What is causing his anxiety? His educational setting, distractions, and disruptive peers. 
I am also going to tell them since getting in contact with Unique and GARD I have found more resources and support then I could ever imagine! If they have no idea of what either organization is, they will after I see them. 
Ideally the outcome would include a treatment plan, but for now I am just relieved that my child will be evaluated. With the properly documented diagnosis and medical reports completed my family will be able to access the resources available in our community.