Can't find my main document

I created a 22 page document in Visio 2007 Prof. The last thing I did was
try to create my own stencils that will be used for my layout. that way it
will be handy when others have to add (racks and network equipment in a data
center). When I open it up, all I get is one page with a shape that I was
trying to create. . . I know the rest of my document is still here because
when I go to File, Properties, Contents tab - it shows all of my pages and
objects. And also, when I save as a web page, my original document is shown.
There are no page tabs at the bottom like usual. No CLOSE button to close
out whatever this "page" is called. On the title bar is says
"datacenter.vsd:Server.30 GROUP - Microsoft Visio" The "Server.30GROUP"
part should not be there.

Thank you!!!