Just a thought... someone close to me has a child with special needs who is never going to leave and live independently, but will always need to be cared for. So worrying in the long term, because, apart from never having the freedom from looking after your child, what does the future hold for that child when parents are no longer around? The reality of a child who does not ever "grow up" and leave is actually not a happy place to be.
Of course we love our kids and miss them when they go, but it's the beginning of a new stage for everyone and the right thing to happen. And it's early days still... I'm sure you'll be fine!
My daughter is the same age and we get on much better now we're living under separate roofs!