I get like that all the time, to be honest. I have so many ideas and tales to tell waiting in my mind to be written, but every time I sit down to get it all out, it just doesn't happen. The ideas remain vivid and beautiful in my mind, but getting them out of my mind onto the physical/digital paper is the hard part. Usually, that's when I turn to another creative outlet in order to kick-start my brain again.
Usually, I turn on some music that's relevant to what I want to express--to better get myself into the "mood". If that's not working alone, I'll grab a pencil and start to illustrate it, even if it's only a scribble for myself, forcing me to better visualize what I want to write. If none of these work, then I either repeat, or go and RP. Typically when I'm writing as Galiae, the latter works rather well, as jumping into her mind helps a ton.
Unfortunately, writers'/artists' block is one of the most difficult things to shake. But you have to be persistent! *flex* As soon as you feel the "mood" come on, start writing before you lose it, and the rest will flow~
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