I usually take time to write my thoughts in a journal. I don't know if you're anything of a Harry Potter fan, but there was this magical device used in the later books to store thoughts and memories and recall them at will at a later day and time. This device was called a Penseive. I liken my journal to that of a Penseive in that I can store my thoughts and ideas in a safe place, and choose when I can go back and reread them. I find my head is much clearer after journaling. Like, beforehand, all my thoughts were a jumbled mess, much like a multicar pileup on a busy freeway. Horns honking, metal crunching, people yelling, all in one huge cacophony that dominated my mind. After writing, it's like the freeway accident has cleared and everything can run smoothly and thoughts can get processed easier and with more efficiency.

So yeah, that's what I do for self care, that and maybe take a nice long hot bath and just soak my worries away for the time being.