I've finished A Feast for Crows now, having agonisingly eked it out for two weeks. 99 percent of my brain is full of the novel and the series and the world. However, now I've finished it, I do hope to slowly ease myself back into writing, even though I will be rereading GRRM for some weeks yet. I want to write at least a few pages of my Walking Shadow sequel this week, just to begin to get myself back into that world. I've not written any of that for about four or five weeks, and it doesn't do to leave a story too long.
I do sometimes wish there was an "off" switch in the brain, that could temporarily turn off obsessions for a while.