Writing is a lexical illness?

Writing feels like some lexical illness. An idea comes, I write it down, and another idea pops into my head when I'm away from my keyboard. Then I have to write it down, add it to the rest. After that I re-read and re-write. Then another idea comes into my head and I think 'wow' where did that come from? And I write it down.
16000 words and growing...:-)