Centuries-old cultural conditioning has given us a nasty neurosis: the belief that happiness must be "earned". It can be "earned" only by enduring unpleasantness (eg work, pain, misery). But how do you know if you've endured enough unpleasantness to deserve happiness? Another unspoken game rule: "responsible adults" can never endure enough unpleasantness to truly deserve happiness.
You're finally on holiday/vacation. Sun, sand, palm trees, etc. You say to yourself:
"I think I deserve this after all those months in the office!" Suddenly, an apparently random worry pops into your head: did you turn off the water before you left for the airport? What about the dripping tap?
Undoing the Worrying Habit