The waiting is the second hardest part, with the exam being the first. I somehow missed my results (I actually think they got lost in the mail) and had to contact them. If for some reason, you don't pass, don't beat yourself up too bad. The test, as you know is brutal. There's no other word for it. There were many when I took mine who were on their 2nd or third try.
When I walked out of the exam, I had NO idea whether I passed or not and that is unusual for me. I generally have have an idea about how close I came but with the CISSP- nothing.
Good luck. If you don't hear from them in a week or so, give them a call.
ISC2 Associate, WCNA, CWNA, OSCP, Network+