Maybe it's because, short of confirmation, your diagnosis is useless? (This is only because I have had down times since my diagnosis when I had sort of pinned all my hopes on it - these opinions are based on my experiences, because... I can't very well base them on anything else!).
I was so relieved after I got my dx, and relieved to not have to wait around to see any more psych people, yet I soon became deflated when realising the available help at uni. Most of it seemed pretty pointless, or things were approached in a way I didn't want them to be (like once again letting me do work on my own, instead of group work, when this means that I don't get to do practical work).
Is the confirmation truly enough for you, or do you think you're unsatisfied that it's not official, still? When my uni psych said he thought it was in all likelyhood AS but that he couldn't actually diagnose me officially himself, I at first felt relieved and validated... but then soon felt that it didn't matter, because when I did get my appointment for a proper assessment there was the chance that they (the specialists) would disagree.
I suppose that, when I felt I had something 'wrong' with me, I concentrated on solving it. And now it's solved, I can't pin my hopes on the discovery anymore.. I'm stuck like this for life, through good and bad, with good and bad. If things were going better in my life I'd probably be perfectly happy having AS, but as they're not it just seems like everything about me is a burden (and I know a lot of it is that I feel I was unlucky enough to get some kind of ADD-type-AS instead of having some amazing skills and/or concentration that I can actually put to use. So, instead of it solving things, there's more parts of my puzzle that need to be solved, but I have no real hope of solving them.
Any of this ring true for you, do you think?