I don't have enough rep to comment, but this is quite urgent: To expand on what Ramhound said, if you seriously need to have this data recovered, you need to unmount the filesystem immediately, before any of the data is overwritten by subsequent writes. You must not remount the file system read/write (you can mount it read-only). If in doubt about how to do this, shut down the machine and do not reboot it.
Recovering the data out of a unix filesystem is tricky - your best bet is to find a data recovery company in your area. I'm guessing this won't be cheap though.