Mac Forum / Applications / Word / March 2007

I am currently working on my thesis and spent yesterday writing.
Today, my plan was to continue working where I left off and when I
opened my MS Word file it became immediately obvious that the work I'd
done yesterday was gone.  I have been backing my information up on a
flashdrive and can only think that somehow I copied the older version
from my flashdrive to my hard drive and then back again.  The point
is, I lost an entire day of work and was wondering if there is anyway
to  get back (revert) to where I had left off yesterday - or is this
information gone forever?  I greatly appreciated any assistance...