Although I'm not actually doing Medicine yet, I think overall it will be the right decision, I hope.
Like someone said earlier, English was my passion for a while - I absolutely adored it (and to be honest I think the only reason I got given intreviews is because my Personal Statement was better written than most other pre Medics) but if I had gone and done an Arts degree, I would be kicking myself for not doing something useful and tangible with my life. I'm not saying the Arts aren't really useful (they're the greatest thing ever really, to put bluntly) but they're not hands on or "in the moment". And equally, if I get into Medical school I'll be kicking myself for not doing something creative and beautiful. Either way, I know I probably won't ever be completely satisfied. But I associate being a doctor and Medicine with an immense amount of work - I could never imagine a non hard worker being a doctor. It's just the way it goes.
And in the middle of revision, I get pissed off and depressed sometimes but really I think to myself, if I wasn't working hard, I would be more pissed off and depressed. I'm just one of those people who is destined to work hard for the rest of their life I think.