USB recovery app for Android?

I'm long term world traveler who uses my galaxy s2 phone for everything. After leaving a country I move the photos from my phone to Facebook and a usb key. Unfortunately my phone rebooted while I was moving photos to my external usb memory key and seems to have corrupted it in the process as it says it is now blank. It contains approximately 20 GB of files so didn't have enough time to delete them they must still be there but the directory or something damaged. I have plugged the usb stick into a laptop which also said it was empty or corrupted. Can anybody suggest a recovery app I can load on my Galaxy S2 (Android device).
Any suggestions appreciated as I won't be home for a long time yet and just arrived in central America where I don't expect to get much help!

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