This diagnosis has been an enormous relief for him. He has always felt different, struggled with mental health and never quite fitted in. The diagnosis has given him a belief he is not broken or defective, just different. He has stopped hating himself so much - very difficult when he sinks into these phases.
He did huge amounts of research before even seeking diagnosis and when his appointment came through he had written over 50 pages of categorised notes (I think it was a special interest). The Tony Attwood book on Asperger’s Syndrome is a very good starting point.
From a practical perspective, one of the most positive things has been with work. He has been open about his diagnosis and adjustments have been made which have really helped - his co-workers don’t see him as being difficult, they understand why he sometimes acts the way he does. He no longer dreads being sacked or forced out which has always caused an inordinate amount of anxiety.
From my perspective it has also helped. Things like I now understand why he takes himself off - even on holidays - and just needs an hour or two by himself just to “decompress”. I know that there is little point in debating certain issues as he is extremely black and white (that said, facts and logic applied correctly can cause him to instantly acknowledge his error - I love this!!). I social situations, he now knows that he can get carried away with making a point and I now am able to defuse situations before they arise and he acknowledges and respects my input. He doesn’t want to cause trouble - he is just a bit passionate (Brexit is a big issue for him - I have to try to steer him clear of Brexiteers!). So whilst we still have our moments, there is a lot more understanding on both sides. We argue less but we weren’t actually that argumentative anyway.
The negative thing is that he sees how society perceives autistic people via the stereotype: aggressive, cold, manipulative, lying, uncaring etc etc and this really gets to him as whilst NT people are recognised as having a wide range of personality traits (from the most warm and wonderful to narcissistic and evil) it seems that autistic people are not afforded the same understanding.
So diagnosis has definitely been beneficial, but it was on his instigation and I think that’s crucial.
Sorry I’ve got a bit carried away writing all that........