That swim seems to me like a miniature model of life. Anxiety crescendos and decrescendos; joy alights and then flies away. Grief goes on and on; overtaking me for a time and then lying low. Those anchovies are still out there somewhere in the ocean; sometimes they're all I can see, and sometimes the water is clear. Things come and then they go.
Fredrickson gives a map of how to induce the upward spiral in our lives-- by intentionally creating and savoring positive moments, states, activities. I took the general principles that she mentions and brainstormed my own lists-- things I could do in my life to shift the balance just slightly from the negative to the positive. Each week, I would create a set of little goals for myself.