This is truly unfortunate and I’m sorry that I don’t know of any way of getting your file back but You may be able to recover the file using a recovery program but I haven’t seen a free one online. I did come across this demo which seems like it might be able to tell you if the file is at all recoverable. Obviously if the demo brings back an unrecoverable file then you need not look any further. On the other hand if it tells you there is recoverable data there then you may want to invest in a recovery program if the file you lost means that much to you. There seems to be many Photoshop recovery programs online but I wouldn’t know which is best. I understand that when one puts their hard work into a project it is a crime to let it go without any attempt at retrieving it. Have you emailed anyone in Adobe about this? As a last resort I certainly would give that try.

The demo: www.officerecovery.com/photoshop/download_demo.htm
Read "Demo Explained"

They do have an auto save program for PS here: www.atopsoft.com/products/autosave/ About $20.00 USD.

Good luck!