Don't feel bad if you think you took things for granted and stuff like that. It's natural to want to see the person you love as much as you can and miss something the most when it's not there anymore. Some people just get it easier than others - just try to make time.
I personally get massive mood swings and start getting terribly irritated and tired if I don't get to talk to my guy at least 2 hours a day.
I hope all goes well x]
A-level results chat here