Hedonic adaptation: the tendency for people to return to a baseline happiness level regardless of what happens to them.
A study conducted on lottery winners and paraplegics concluded that neither group was either happier or sadder less than 6 months after the event.
Get yerself sum!
A person’s long-term happiness is not significantly affected by otherwise impacting events. So if you were an unhappy misery-guts before the impacting event, you’re definitely going to need extra help to see the bright side of life.