I am in exactly the same situation (uni stress). I just don't know what to do - and even though I'm looking forward to it, I don't feel so grown up that I can just leave and start over!
Anyway, in your case, I would say go for the course you want to study. I know it can cause stress if you like your current location, but I'm sure tonnes of students going off to university will probably feel the same way this September. But they all have some sort of course/future they wish to pursue, and you can do this if you study the course YOU want to do. And, as you said, you could gain so much moving to a different place, meeting new people, having new experiences - the opportunities are endless! Hope all goes well.
xxx