If you're not worrying about the environment you'll be fretting about the economy, and if that's not doing your head in there's always the threat of terrorism, or whether you're having a 'normal' sex life, or drinking too much, or lingering too long in the pub, and so on, and so on.
We've become a nation of worriers, and the counselling and therapy businesses are booming.
I once sat in a restaurant in Brunei talking to a client about his business. Things were going OK, and he was in an expansive mood, relaxing with a big cigar and gazing out over the South China sea as night fell; he defined the word 'relaxed'. I asked him how he coped with the pressure of his business (oil), and the stresses it brought. "It's simple" he said "I leave the worrying to the people I owe money to".