John_B - 2:02 pm on Feb 21, 2013 (gmt 0)

Hi,
It is unfortunate that your ranking has gone down.I had the same experience with my site once but i was advised by a SEO expert to use an rank analying and monitoring tool which not only analyses my page rank but also helps to monitor my ranking on daily basis.That is how i can to know about GeoRanker. With this tool,you even get a report on a daily,weekly or even monthly basis.This analyzer has helped me to know when my new SEO strategies are not working and i can therefore rectify them before my ranking falls significantly.

Good luck !