Does it feel like everyone else is having more fun than you? Taking better vacations, going to trendier bars or cooler art exhibits or playing with newer tech gadgets? Do you worry when you step away from your iphone or email in case you miss something important (even when you're not expecting anything)?  If so, you could be suffering from the latest in our line of modern mental ailments -- there was Affluenza, Comparativitis, and now, FOMO -- the Fear of Missing Out.