any history of heart illness in the family? what's your non drug related diet like? poms love the shitty fatty foods dont they, or did jamie oliver change that?
hopefully its just a wake up call to chill a bit. plenty of years a head of you mate. i think its a pretty natural thing to start having a good look at ones own actions and lifestyle around the age of 25. i know i started to tone down a little and a lot of my friends have done like wise, thats not to say we dont still hit it hard on the odd occasion.