My Page is cached, but no longer is indexed!

I had a page on my site that I was getting a lot of traffic for, and now today it is not even indexed in google anymore! If I search for the cached version it is still there, but google does not show it if I search for all pages on my site. And now, many other pages have copied the content that I had on that page, now I have added a sitemap, (if and) when my page returns to the index will it be in a lower position? Any knowledge/advice would be greatly appreciated

 

Don't worry, might be a data center update. Give it 24-48 hours before you start worrying.

 

Alright.. what do I do if it does go beyond 48 hours??

 

If not indexed then submit that particular page again in Google.

 

With 90% probability I can tell those people who have copied content from your website will outrank you, do not belive me , copy some content from anywhere you like put in a blog and then make few people comments on the blog , put the blog in ur signature, The great google search algorithm will treat the blog as more lively content than that of your original content
In one word you got s*rewed.

 

Well the page got reindexed by google, and I am at the top spot for its primary keyword again, however its secondary keyword I am 2 spots below the copied content, which someone put on youtube