One of the benefits and hazards of using terminal is that changes are immediate and irreversible. There's a very small window following a file deletion where that file might be recoverable. However, it requires stopping what you're doing immediately, powering down the system, and avoiding any more changes to the hard drive that might overwrite the space where that file was located.
DataRescue is a $99 app that can assist in recovering lost files. It has a free demo, where it will show what it might be able to recover. At that point, you can decide whether or not the $99 is worth it, pay the fee, enter the code and recover your data. Unfortunately, I have to agree with Virgeist - I hope there was a backup somewhere along the line.