Same thing happened to a good friend. They will ask to see your hospital reports, and try to determine if you suffered a "head injury". Were you at all concused, or cant remember bits after the crash, or do you remember everything? What diagnostic tools did the hosptail use? (x-ray, MRI etc.) I assume you went...
If they deem a head injury occured, depending on the seriousness, they may place an "OML" restriction( for one year). This means you can only excercise your Class 1 privelages as, or with, another qualified co-pilot (which for most commercial pilots is not a big deal at all). If it was really serious I suppose they may ground. You will need to get your A+E report, and that (at least in the UK) ain't always easy!
Best of luck!