Is there an upside to feeling down?

An article from the British Psychological Society explains how feeling bad isn’t so bad https://digest.bps.org.uk/2016/03/31/10-studies-that-show-the-advantages-of-feeling-sad/.  There was a time that I would let a down day start a spiral of negativity that could get out of control.   When we focus on what is going wrong we seem to draw further calamity toward us.   There are ways to make more of your bad feelings not so bad, or so frequent.