FL/KY, I feel ya! I hope someone has some good advice for you on this,
but it'll be hard for you to get used to. Maybe you need to think of
things you have put off for yourself while supporting your child all
these years and do some of those things.
BOTH you and your daughter are embarking on a new journey of
independence, and your journey may be more difficult than hers! Maybe
you need to start with psyching yourself up to appreciate the
"liberating" aspect of it (and you will have to psych yourself, as it
does not feel so liberating at first!) Your daughter will find it much
easier to feel liberated because she will be immersed in new
experiences and surroundings, while you are left in the family home
experiencing her absence for the first time in your life -- and with
lots of reminders that she's no longer under your roof. You will both
be fine, but you have the greater challenge!