"urgent!!" does not normally make anyone here move faster....
Was it a system file or one of your own? I don't know what shift-delete is, but I infer it is a way of bypassing the trash. If so, it is just like deleting the file in a terminal: The links are broken, but the data is still on the drive.
If it is really critical, then there are a variety of file recovery utilities out there--I have no personal experience in any of them. Search here or on Google using "linux file recovery" or similar.