I’ve noticed that when I received really good news such as a pay raise, a promotion, really great results from a test (in college). The happiness level rises up for a very short time (less than 1 hour), then my emotion tappers off back to what it was before.
This could be the way my brain is wired. I tend to dwell on the negative, or what I could be doing better.
To try to reverse not savoring the moment, I try to remind myself to ride the high of the good news for at least a week. This works very well and helps me to be grateful for the good news and builds up my resilience for the bad news when and if it ever comes.