Kay and John,
How did it all go? Any updates so far?
You must remember that even though your son gets the Asperger diagnosis, he will not change- he'll still be your son, and he'll stay the way he has always been.
See the diagnosis as an opportunity to help him- an opportunity to understand what is going on in your son's head when he gets frustrated because he doesn't understand other people or because someone teases him because he's different- it WILL help you a lot.
If aspergers is diagnosed as early as your son's condition is, you can help him more than you'd believe- he'll grow up almost like any other adult as you'll be able to help him when the problems occur. Also, you can tell him that you understand what he's going through (you may not be able to 100%, but at least you know it's because of aspergers).
Remember, aspergers is not an illness, nor a "condition". It's simply a part of the person who is your son- and you already love him- why would a simple label change this?
You'll get a lot of answers if your son is diagnosed with AS... it will explain a lot.
Your son is happy and will stay that way- and with a diagnosis, he will get the help he needs.
I wish you all the best of luck!