Need help with memory stick thats changed all my folders and files

Hello, when i plugged in my memory stick this morning to finish off the last of my college work and to back it u to my computer i was greeted with all of my folders and files names being changed and unable to open any of them, is there a solution to fix all this as there is my years worth of college work on here. Also when I try to scan and fix my memory stick and attempt to recover bad sectors it stops and says "Windows cant check the disc while its in use" and asks if i want to force dismount.
I have no idea how to resolve this and would appreciate any help at all as my assignments have to be in for Tuesday. Thank you.
 
Hi thanks for your reply, at the minute im trying to see if i can salvage anything as ive just found out the folder that has all of my work in has been converted into a single file, if it fails then i will have to try other methods. I will post if it works or not.
 
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