I got a formal diagnosis in 2019. I thought it was worth it but not in any tangible sense.
I retired in 2011 and I do not need treatment nor accommodations...though I have, mostly unsuccessfully, been trying to get my medical care practitioners to adjust how they work with me.
Self-diagnosis is accepted by WP and in some countries a formal diagnosis might not be readily available. I did not want to go with self-diagnosis because my Autistic traits are mild enough I thought I was close to the margin between Autistic and not Autistic...that is, I thought I might be either barely Autistic or almost Autistic. Plus, I am not a professional so I couldn't rule out I was just plain wrong about it. A formal diagnosis removed any doubts.
A formal diagnosis also meant I wouldn't feel the need to always qualify my statements to note that the diagnosis was not official.
It was absolutely wonderful to know that it wasn't my imagination, other people really are different. That alone was worth the price of the diagnosis to me; in fact, I almost didn't bother submitting the bill to my insurance for partial reimbursement.
The Psychologist who assessed me normally does an IQ test as part of the assessment but was conscientious enough to note that it really wasn't necessary for me...I joined Mensa in 1981. I saved some money on the assessment by not getting the IQ test.
If you go to any of the gatherings we could DM to see if our paths cross.
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When diagnosed I bought champagne!
I finally knew why people were strange.