Add Yahoo as a preferred source to see more of our stories on Google. Experts break down what’s behind the vacation blues — and how to get over them. (Getty Images) (Guillermo Spelucin via Getty ...

So you booked the flights, planned and packed, set your out-of-office email and you’re finally here: on the beach or the mountain or in a brand-new city. You’re on vacation, and yet ... you feel ...