The attached link to the article by Kira M. Newman for the Greater Good Magazine addresses the highs and lows of a rollercoaster of an emotional life.
Newman sites two studies that provide potential answers to create more stability in our emotional lives. It is a quick read so I will not give any more info away, enjoy.
https://greatergood.berkeley.edu/article/item/two_keys_to_a_calmer_emotional_life