Your question is classic. I'd venture to say that 98 out of 100 people who finished taking their exam felt that they had blown it and there was no way they could have passed. On the other hand, many people I've known who left the exam feeling rather confident were the ones who didn't pass! Your freaking out feelings are really a good sign, historically.
I graduated in 1991 and we still took our NCLEX on paper and had to wait about 3 months to receive our results. If we received a regular sized envelope iin the mail that usually meant we passed, but if the envolope was a large 8.5 x 11 size, that was bad news because it told you of the failing grade and included all the papers needed for you to reapply...
Also remember that the NCLEX is testing you for "minimum competency"... that you are safe to practice nursing... not an expert. It's like you have to make a "C" on the NCLEX. Later on, if you take a test for certification in an specialized area, you'll have to make like an "A" on that test.
My vote is that you passed!! Please let us know when you find out for sure.
By the way, my Aunt, who went to nursing school
and graduated in 1942 received her results 3 months later in the mail... but they didn't send the result in an envelope... they came on a little postcard. She said back then that Everyone knew how well you did, even before you did! LOL
I will send up a little prayer for you for peace and calm while you wait. Think positive, it's very powerful!