goodroi - 6:57 pm on Jan 17, 2013 (gmt 0)

Simply by hearing about your widespread drop in rankings and traffic I would think you have a big problem. I would start looking with the basics:

-make sure you have pages with significant & unique content
-focus more on quality of links & less on quantity of links
-improve site layout and overall usability
-use appropriate social sites to better connect with your market