Well, that is a difficult situation indeed. Is there any bit of the card at all exposed? If so, you can (with battery OUT!!!) try a very sharp needle to press into the plastic surface so as to get a grip on it and try to wiggle the remainder out of the slot. Be very very careful...you can damage things if you are overly aggressive doing such things.
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.