I am experiencing Brainfail. I am still articulate but there are parts that aren’t registering on internal scans. I may try writing when I leave work; having gaps in my head seems to help with this. I think because the bits that hold me back might be gone.
See http://www.nanowrimo.org/ to learn about inner editor curse. I bought a copy of the book but last November I got ill and couldn’t do it.