I was like that last year when I got the envelope. I walked around the classroom for about half an hour before I opened it. I didn't get what I wanted but I still got into uni and that's all that mattered.
At the end of the day, all I wanted was to do well enough to get a place at uni, I wasn't bothered about getting four As. I knew I wouldn't anyway because my AS results weren't good but I wasn't going to make myself ill over revision.
This sounds strange but I actually find uni work easier than A level work. Maybe because it's enjoyable and I love what I'm doing whereas I hated my A levels and regret the subjects I chose.