Hi sadintexas,
There are some wonderful books on the Empty Nest Syndrome. I like the Chicken Soup books and they have one on this subject. One is available for download on Kindle or to any tablet or smartphone. The title is "Chicken Soup for the Soul: Empty Nesters: 101 Stories about Surviving and Thriving When the Kids Leave Home"
There are many articles on the net, too that may be helpful to you. I would start a new hobby....stay busy until the worst passes. Maybe someone reading your post can offer some advice if they have also experienced this sadness. Keep posting your feelings....we're listening.
Holding good thoughts for you.
Love,
Terry