First go to the section here at WP for Autism/Asperger's forums. You will find at least one post article with links to online tests you can take. Bring copies of your online test results with you when you finally do see a psych doc. Also do some research here and at other sites for info on Autism/Asperger's spectrum disorders. Make a list of any traits you have that are listed on the spectrum, and bring that with you, too. This should help in your session with the doc.
And welcome to Wrong Planet! You are among friends here at WP!
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau