Money is a carrot on a stick. It's not fulfillment.
We find lasting fulfillment and self-worth through our connections with each other. With your kid, with your co-workers. With other people in your life.
Try consciously putting your attention on the things that are actually fulfilling. Money doesn't buy happiness. It does make life easier. But happiness is the time you spend with your kid, not the money you spend on him.
Been meditating for years, and it took me a long time to realize that excitement is not happiness. But closer to what Buddhism calls restlessness and worry. And it tends to cycle with sloth and torpor in a pattern very similar to what we call bipolar.
Manic episodes, for me, are when the excitement keeps going without any rest. Exhaustion occurs. And delirium sets in.
I don't find any of these states pleasurable (i.e. euphoric). Joy is what I equate closest to euphoria. An overflowing abundance of positive feelings shared with others. I imagine if we got worried or restless hanging onto that positive feeling, it could play a role in the cycle though.
Happiness is calm, restful. A lack of restlessness, anger, sloth and torpor, etc. Contentedness is a synonym for happy.
Anger/Desire, are, at base, aversion and attachment. If I'm attached to joy or angry at my depression, those are additional factors that keep us caught in the cycle.
https://en.wikipedia.org/wiki/Five_hindrances