I found out a few days ago (see the 'Confused' thread). I've seen shrinks for a lot of my life, and AS was never mentioned. I even took the AQ test a while ago, got a 'probable aspie' result, and shrugged it off thinking "wouldn't it be a relief if that's what it actually was". Doh! (slaps forehead) What made it click for me was browsing the fora here and recognising so many things in myself.
I don't think I've ever had SAD; if I did, it probably got lost in the general swamp of depression.
Anyway, welcome to WrongPlanet, it seems like a pretty cool place.
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Ever tried. Ever failed. No matter. Try again. Fail again. Fail better.
-- Samuel Beckett