It's basically weird
However you feel about it - whether you're happy or not - the fact that you will have no kids living at home any more is basically weird. The chances are you've had at least one child at home for at least 16 years. It could be many more kids, for many more years. And to go from all that activity, noise, food, mess....to neat silence. Well that's got to be weird. At the very best. And miserable at worst.
Check out the website I set up in an attempt to put together, in one place, information about this step in your life. This includes an explanation of what Empty Nest Syndrome is, support groups and ideas to cope.
Also I'd really like to hear from you, what your story is. Or any more useful stuff you think I should add to the website.