In my experience, you don't have to sacrifice the "OMG" to mitigate the "oh no". Learning to direct one's thoughts is a really powerful force in making oneself happy.

I'm always amazed by the number of people who don't seem to realize that it is possible guide one's thoughts to control or modify emotions. People seem to think that happiness or unhappiness just happen, and it can't be controlled. These people are usually much less happy than others.