Hello MIke,
I'm sorry to hear of your missing file.  You might try:
(1)  If you haven't already, search your trash, the path which might be something like:    ~/.local/share/Trash/files
(2)  Run the command:     find ~ -iname '*string*'            # Where "string" is a piece of the name of your missing file.  You can use "globbing".
(3)  Or try:                         find ~ -atime 2 || -ctime 2        # Any file accessed or changed within the last 2x24=48 hours
(4)  Or try:                         find ~ -ctime 2 -and -iname '*string*'         # Etcetera, etcetera ...
(5)  Or, use some special software for recovering files which were removed with the command "rm".

good luck,
Doug.