Non-upsetness? Could this be akin to content? Stable? Calm? I think happiness, like seriously upset at the other end of the spectrum, is a momentary thing. Contentment with light heartedness, which is how you are coming across, seems to me to be a very satisfactory way of being. As a default position, you are to be congratulated.

Life isn't a set of scales, I'm not sure that we can balance things against each other. That requires a constant vigil of judging ones experiences, rather than letting go and just, well, experiencing. Bound to dull the edge.

Contentement with sunny spells and scattered showers is a good aspiration.

Oh and make sure your thumb isn't infected!

Stable and calm, perhaps, but I'm not sure I'd go as far as content. There's a lingering low-grade dissatisfaction which distinguishes this from contentment. There just hadn't happened to be any specific single blows for a couple of weeks...