My computer does not recognise my usb key anymore?

I have spent the best part of yesterday working of some lessons I needed to prepare.
Happy with myself I stupidly only saved them on a new external usb key which was at the time recognised by the Mac.
However, when I tried to plug that key on another pc it asked me to format it?? Obviously I did not has all my work was on it. SO  I returned to my good old Mac and inserted the key... guess what? It refused to recognise it either. I could not even restore anything... Where has my work gone??? How can I retreive it?
Please, I do understand I should have been a bit more clearver and save it in two location but I did not.. I now need some help, if anyone could I would be so eternaly grateful>

if one remove usb sticks without first ejecting them this can happen
the data becomes corrupt
you can try googling for various tools which may or may not be able to recover the data
salvage corrupt usb stick
if they can't then there are companys which make a living on salvaging deleted data but of cause that is pricy

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