Not to be harsh, but you ask what is the difference between the day before your NCLEX and the day after? The day before it's assumed you will pass based on national pass rate averages. The day after no assumptions are necessary, you've demonstrated that you did not pass the NCLEX (for now). If the NCLEX is a test of competence, and you fail it, you can see how the hospital you're working for can not continue to allow you to provide RN-level care.
That said, people fail their NCLEX and it isn't that they aren't competant RNs, it just may mean they aren't great test takers. So stay the course and make the best of it and know that many, many GNs who fail the NCLEX in the country are in the same boat as you - working as an aide waiting to re-test.