Congratulations on 2 years!!! I know you have got to be going though a lot of anxiety right now, but maybe some perspective might help:
That was two years ago and you have paid your dues. You are no longer guilty nor do you need to feel afraid. At the same time if you mention it to the people who you worked with before you might just be giving them a stick to hit you with. I felt compelled to confess a lot when I really shouldn't have. I would just "let go and let GOD", hold your head up and be the great nurse that you are.