All of these things can be overwhelming. As for married people, Broadbent suggests negotiating family times for Christmas. As for regret, Broadbent said to let it go. Dieters avoiding rich, fatty foods prepared for most Christmas feasts might feel shorted, while those who choose to indulge might feel guilty. We're supposed to eat, drink and be merry.
Depression is an indication that something is amiss.
One, the actual problem and two, our reaction to the problem. Sometimes our reaction to the problem might be more of a problem than the initial problem. Say you have to be with someone over the holidays and you don't want to. You get depressed. Then it overwhelms you.