Amy honey - I have very little to add to what others have said but I still feel I have to say it.
You have been a die hard here for such a long time and losing you would be a real loss to us all. You have in no way let anyone down and nor should you feel as if you have.
Why not take a little time to reflect upon your decision, think it through and come back to us all refreshed!
How on earth would we cope without santas little helper