Asperger's Syndrome, benefits of a full diagnosis?

I’m 21 years old, and was taken to a therapist around the time when I was 13 by my father. We got far enough that she was able to whittle down some mental disorders, but never came to a full diagnosis. Asperger’s Syndrome was near the top of the list, its a high-functioning autistic syndrome. I’ve just recently discovered this, and that my mom purposefully stopped my dad from taking me again before we got a full diagnosis. I have to admit, I felt extremely hurt that they kept something like that from me for 7 years, and I got my dad’s side of the story, but not my mom’s. I have two questions:

Should I go to a therapist to confirm a diagnosis of Asperger’s Syndrome (or similar condition), and what would the benefits of doing so be?

Should I confront my mother about WHY she made my dad stop taking me to the therapist before a full diagnosis was made?