Hi Lynne,
I would first ask Can you access your blog dashboard? Is it still there?
If so than go to Design and swithch back to one of the default themes
and see if your site works (shows up)
If it does and your content is there then just reupload your theme of
choice ***compatiable with WP-2.6*** and go back to design and select your theme.
If all is not well then you will most likely need to do a complete reinstall
and yes your content *should* be in your database backup.
This is about all I can suggest with out more info/looking at your site
backend.
P.S. Disable all your plugins if you can until it works again, then reactivate them.
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