Hugs to BiscuitTin, Jacq, Googley, and everyone else who gets depressed on weekends!
You know, if I could insert myself into your mind, BiscuitTin, I'd make sure "I come up with curious, fantastic ideas and images" got into your list of 30 good things about yourself. Just my opinion, but life tends to erode people's powers of imagination, and if you can still come up with cool, wild thoughts like the ones you mentioned, something is going on inside you that's resisting the erosion. Oddly, it may be related to your illness, but I still think it's positive.
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My dog

mastered the "fetch" command. He would communicate he wanted something, and I would fetch it.