When I am feeling emotionally drained and having a hard time motivating myself to get anything done, I ask myself if there is anything that doesn't require too much effort and always makes me feel a little better.
There are some things like watching a movie, listening to music, eating ice cream which make me feel a little better for the moment (or at least they make me forget). But these things involve being passive and I end up feeling much worse afterward.
Some slightly more active things I do which are sometimes helpful for me are taking a walk in the forest, taking pictures, playing with my cat, baking and gardening. Which activity makes you feel a little better?