The holiday season can be a very emotional time of the year for many people. The loss of sunshine can cause seasonal disorders i.e. an increase in depression. You do the best you can. We all have days when we just aren't feeling the love. Just put this day behind you and look forward to a better day tomorrow.
If you're having cravings, now is the time to nourish your body with wholesome foods. try not to dive into the junk because that could make any depression you're experiencing worse. excess sugar has been linked to mood disorders.
Try not to worry, I'm sure your blues will pass. Just think of all the GOOD things that are happening in your life right now. that's what matters most.