Hi,
Ooooops! You might not be able to recover your file. Your system may have already re-used the space (or part of it) for something else. This is a very good persuader to backup your important files. When you issue commands to a linux system it won't make you get down on your knees and beg and reaffirm and reaffirm the affirmation and then ask if you are sure ten or twenty times (although some gui apps will do this). Backups have saved my bacon numerous times since the 80s.
See
http://www.trinityhome.org
Look at their recovery tools. I used them on some drives to recover some of the data that was lost when the OS failed (Windows or course). Don't use the computer with the lost data as it may (certainly will eventually) overwrite the data you hope to recover. This is a very time consuming process and you may end up with little or nothing. Good luck.
Bill