Daydreams have become warped

I can't say that I really have experienced this personally. While my daydreams generally have visual, they're much more focused on the feelings and emotions rather than what I'm seeing. But generally the more familiar I am with a person or location, the more vivid it is visually. I have a much easier time visualizing people and locations that I know in real life rather than ones completely made up or from books or whatever. Perhaps your focus isn't as... focused... as usual. Or maybe you're having a kind of creative block. If you aren't interested in stopping your daydreaming altogether, I would suggest just going with the flow. It'll probably fix itself on its own in time, but if you latch onto the anxiety and depression that its causing, it'll probably take much longer because then you'll be expecting and fearing it being not what you want it to be, creating a kind of self fulfilling prophecy.