Choose your sparring partners very carefully. Judo is a full-contact sport and some people simply don't care about the safety of those they do randori with. I say this as I'm laid up for two months with a broken fibula from Judo which you could hear snap halfway across the dojo. If your spidey sense goes off (as mine did), just politely decline (like I did not).
-Mark
Oh my days, that's awful thing to happen! I'm so sorry, I hope it's not going to mess you around too much with things like work. I'm sure though you will come back from it fighting fit again. Take care of yourself.