Whatever you were thinking of doing, do it. Even if it’s tackling something you didn’t want to, have a go. Feeling out of it, a little bit down, try to make the effort.
Perhaps try doing something active like go for a brisk walk, go and see an old friend so that you’re out of the house, do some ironing, or start something new that you’ve put off that you’ve been meaning to do, like a project or a hobby.
Not only will you begin to feel better, because being active promotes motivation, but afterwards you’ll feel so much better for pushing yourself through. If today doesn’t work, try tomorrow.