ZT,
Hello, this is Kitt. I feel so bad for you as I had my first major anxiety/depression episode when my oldest son went off to the Marines right after he graduated H.S. I still had 3 children at home and thought I was fine with it but the empty next syndrome hit me right over the head.
I learned after that to prepare myself for reality but it sounds like you have just the one and you are already missing him.
When my youngest went off to college I took the venture with him and loved going to the campus to visit. It was a 5 hour drive for me but I enjoyed every single visit and the year he was homecoming king I was there along with his sister and we cried with joy and pride. So start planning your trips and remember he will always be your son. You had him first now you are just sharing him with the world.
Coming here and talking to us is a wonderful way to get your feelings out there. Make sure you tell that young man how much you will miss him and that you will be visiting.
It is often difficult reaching milestones but remember exciting times are ahead for both of you.
Bless you
Kitt