I am a year on from this now, my DD is about to start her 2nd year in a couple of weeks. See my responses to posts during this thread.
I am not going to sugar coat it, the dropping off, leaving them there, and the first month at least was bloody hard. I am extremely close to my DD and not knowing what she was up to, and being part of her life in the way I once was, took a massive amount of adjustment.
It massively helps if they are happy. I can't comment from any other viewpoint, only my own. My DD loved it. She settled, made friends, enjoyed the freedom, the independence and the city life. She enjoyed her course and took to it like a duck to water. When I could see she was happy and thriving, it made it MUCH easier.
We arranged a once a week Facetime call where we just chatted and caught up every week, and then in the week would exchange the odd message here or there, but for the most part I stepped back and let her get on with it.
It won't be easy, you will miss her, feel empty and a bit lost for a while but I PROMISE it gets easier.
My girl was home for reading week in October, and again at Xmas and again for reading week in February and then she was back home after the end of the first year before I knew it.
Reach out here during those first few uni weeks as there will be loads of others dealing with the same thing and the same emotions as you are. There was an ongoing thread last year called Uni Starters on here and it was invaluable for me in the build up and during those early weeks. I am sure there will be another one for this years starters so keep your peepers out for that.
What you are feeling is normal. Its the shit part of being a parent that no-one warns you about.