Thank you so much for this thread!! Really helpful ideas that I will definitely use.
One thing that sort of lifts me up a bit when I am in that dark place is grounding especially using nature.
I go out in the garden or to a park with big trees, a lake, tall grass or whatever. I walk barefoot. I physically feel the grass or dirt under my feet. I give a tree a hug, I smell the bark and the leaves, I touch it. I lie flat on my back and look up to the sky. I splash cold water in my face. Feel the breeze on my face. ect. I only think about my sensations, the here and now what I am physically feeling with regards to the object and the earth underneath my feet.
I do it in my back yard, or with my pet. It revitalises me.