usb flash drive problem

Hi, I was gonna transfer some stuff to my 32gb flash drive but I had a trouble with some files so I decided to unplugged it. It gave me some messages ( options),but for some reason I ignored them all,kept clicking and I took it out.When I put flash drive back to my Mac pro it says: The disk you inserted was not readable by this computer..I have tried utilities but nothing works. I have read that it can be done on the Pc,but northing at all. I dont want to loose my flash drive just by some stupid mistake. Can I do something with it? any help guys? Thanx