If you deleted your files off INTERNAL STORAGE, you may be in luck.
I have not verified this, but this is what I would do...
Download the freeware version of Handy Recovery:
http://www.handyrecovery.com/handyrecovery-fw.exe
Connect your device to your computer using USB FLASH DRIVE METHOD, NOT ACTIVESYNC.
Run HandyRecovery on the drive.
If Handy Recovery does not work, google out a freeware data recovery app that supports USB flash drives.
Important: During this time, don't use your device or you may corrupt the deleted files.
Edit: You're running a Macbook, aren't you? Sorry, all the good recovery apps for for Windows.