Do posts disappear after a certain time?

In June of 2012 I started a post titled "120X more data usage? WHAT?? Any ideas?"   I kept it updated over the two years.  I just now wanted to update it and spend an hour looking for it when I finally found a link in my email from an update and it seems 

"You do not have sufficient privileges for this resource or its parent to perform this action.

Click your browser's Back button to continue."

Does this mean my post is gone?  If it's not in public view is there at least a link an admin can message me  so I can save the post?   (for my own reference).  It hasn't even been two years yet.   I last updated it in February, just three months ago.