Well went to the physio (my brother is one, so that's handy)
First thing was he didn't know what a snatch was, and looked shocked when i showed him. He did know what a clean was, however, so not all's lost.
Good new is, there's no major nerve damage. He wasn't exactly sure what I'd done to it but massage seemed to increase the range of motion and reduce the pain.
Don't know if this helps anyone but I said I'd throw it up.