I thought I'd share this link as I think some members may benefit from it. It's an article but it also links to several TedX talks for those who like videos.
We all face rejection, sadness, fear, and unhappiness. When we find ourselves getting stuck on the negative aspects of our lives, however, it helps to be aware of why we might be doing so. We may be evolutionarily hard-wired to focus on negative things, but it’s possible to retrain our brains to adopt more positive frames of reference and boost our wellbeing.
Positive psychology is not about eliminating negative thoughts and emotions from our everyday experiences; it’s more concerned with how we handle them. With an understanding of negativity bias, we can start to interact with adverse events, trauma, and so forth more adaptively.