Its impossible to say - it does sound like the flash on your USB is stuffed, in which case (as you claim to not have soldering skills, and even soldering skills may not enough), in which case you need to go to a data recovery/forensic specialist and pay $$$$ if the contents of the drive is that valuable to you.
Before you do that though, you may want to get another USB key, put Linux on it (Ubuntu + download packages or a rescue disk type distro), and then try using Photorec (part of the TestDisk suite) to see if you can pull any data off. Its conceivable that your disk was being updated at the time you knocked it, killing your FAT table or equivalent. Photorec won't recover everything, but if its got small documents or photos you may get lucky with some stuff.