A habit cannot be tossed out the window; it must be coaxed down the stairs a step at a time.
Don't just sit there and worry. Be proactive. Do something - anything - about what's worrying you so you can gain information, focus and control over the situation. I've suffered a great many catastrophes in my life. Most of them never happened.
What do you think of the human mind? I mean, in case you think there is a human mind.
Balloon: Thing to take meteroric observations and commit suicide with.
If you hold a cat by the tail you learn things you cannot learn any other way.
But the elastic heart of youth cannot be compressed into one constrained shape long at a time.