BeeDeeDubbleU - 10:20 am on Sep 11, 2013 (gmt 0)
I feel your pain!
AdSense is not my main business but I am self-employed and have used it to supplement my other earnings for several years. At its peak I hit £1100 per month. I am now lucky to get £35!
My main sites (those which generate my work) have all bombed for no apparent reason and they remain on a downward spiral with regard to traffic. I am now thinking of retiring as trying to maintain any sort of Google rank is just too much work.