Hung Over Until Next Year

“The better the night, the worse the day after.”
Often The Chemical Buddha would be seen enjoying himself one night only to look like the undead the next day. The good news is, he would just start all over again and have another "best night of his life." The Chemical Buddha believed this pointed to the transitory nature of life. One moment you're up, the next you're down and vice versa. He recommended not becoming too attached to one or the other because it will only change. And both are a part of each other. There is a little bad in every good and a little good in every bad. At the dawning of the Christian New Year (because the Western calendar is based on the presumed birth of Jesus), if he were still among us, The Chemical Buddha would hope you are able to apply the learnings of this past to attain more happiness and fulfillment today. Or, he would at least hope you'd fill up on whatever makes you happy.
What is the cost of the highs and lows in your life?
What one thing from your past do you need to learn from in order to attain happiness today?