Really this is the same problem I was facing 3 months back. My all files were hidden whatever I had downloaded were missing. I was looking for hidden files app similar to this one http://www.showhiddenfilesmac.com, that can easily help me out to display the hidden files I have downloaded.
I have tried,
defaults write com.apple.finder AppleShowAllFiles TRUE
defaults write com.apple.finder AppleShowAllFiles FALSE
but it does not work for me.