I'm not entirely sure whether I have an overriding special interest, but I definately periodically latch on to things (like films, games, types of music) obsessively and read up on everything about them, before losing interest after a time or once the thing is watched/played/exhausted. Is this normal for AS?
At the moment my interest is in Dragon Age 2 (it was announced last week), Scott Pilgrim (the final comic, the movie, and the game are all coming out this summer), and this forum.
Anyway, to answer your question, yes, I have had that feeling a few times in this last year. While I was in school and university I never had enough free time to completely exhaust my obsessions (usually video games, films and music), so I always had fresh things to move on to once my old obsession ended. Now that I've been out of university for almost a year, and I'm unemployed, I have too much free time. Every game I'm interested in, I play to completion multiple times until I can't play anymore, and the industry just can't produce enough new ones to keep up with me.
I end up feeling like I have nothing to do, not knowing what to do with myself, and cursing the fact that I have no social life and no regular hobbies that would get me out of the house or help expand my horizons. The worst part is, I would dearly love to be able to play the bass guitar, and I have a bass to practice on, but I just can't seem to shift my obsessive tendencies onto it. Instead, I end up sat at my computer, obsessively refreshing my bookmarks all day.
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If songs were lines in a conversation, the situation would be fine.