My son left for college 2 years ago, but I still have my little girl at home so it wasn't so hard. She starts high school this year and I am starting to think about losing her as well. As you said, it goes so fast. We dropped our son at the airport today to start his junior year of college. It just flies.... When I married my husband, 23 years ago, his daughter was 11 so we have always had young children at home. I thought I was looking forward to some time alone with him, but as the time approaches it seems less and less desirable.
Sorry to change the subject a little. Just saying I sort of understand how you feel. It is a huge change and not really a good one. Still it is better than the alternative - that they don't grow up and never leave the house.