Empty Nest...bah humbug!

I had my son---my only child---when I was just 22 years old.  My son is now getting ready to graduate from high school and head off to college.  Sometimes I have a hard time with that.  I'm not thrilled with the idea of my only child not being around all the time anymore.  He and I both celebrate milestone birthdays this year:  he's turning 18 and I'm turning 40.  If one more person points out to me that my husband and I will soon be empty nesters, I think I'm going to vomit!