Okay, thanks. My friend said when her site was hit it was a 45% drop overnight. Mine hasn't tanked like that, but it's a 45% drop in 12 months.
I still rank one with some of my search terms but the bulk of the articles have dropped. I was in the top 3 for almost all my articles, now I'm more like in the top 10. But some crappy sites are outranking me.
What I've done so far is re-write any duplicate content (only about 10 articles), set up the authorship tag, made the Facebook page more active, removed the ad from the beginning of the content, added lots of new content, added new images where possible, and re-added social sharing buttons (they vanished a while ago & I didn't bother to put them back on).
But none of those may have an effect. My main article slips further down the page very day. It had the no. 1 spot for years. It's frustrating when you don't know what the cause is.