The concept of FOMO is widely known these days. This term for “the fear of missing out” even made it into dictionaries starting in 2013. But fewer people are familiar with a related and similarly potent force: FOBO. If you’re someone who agonizes over every big and small decision (even after the choice has been made), then you’re probably well acquainted with the experience of FOBO. That doesn’t mean it’s a good thing, however. Below, experts break down the definition and mental health