---- Google Updates and SERP Changes - August 2013
Martin_Ice_Web - 5:49 pm on Aug 17, 2013 (gmt 0)
Google feels like Bing.
No, bing is much better now then g$$gle. It does not rewrite your query, it has all the old stuff that was in g$$gle before panda still on top.
It sounds like your niche suffers the same problem other niches do since long time now. G. "figured out" the main dominant/leading site in your niche. This one rules, all others suffer. This now could be after introducing categories for all niches. Maybe they added a lot more in this quality update.
Maby it is a glitch and your site returns in the next days. I cross my fingers for you.