Hi,
Writer's Block, for me, is a weird concept ... I work on the instinct anyway, so at any time I will get up and go write something, and it might take me 5 minutes, it might take an hour or much more. Poems are like that for me, even in the middle of the night, a line shows up, and I get up and go write it and continue on it, since the "inspiration" is right there.
Being, so internal, for me, the only requirement is feeling OK inside. For example, if I am having some bad moments with the blood pressure headaches and they are compounded with a cold/flu, then, the amount of lines is difficult and writing, has very little continuity for me.
Since most of my work is about that visual continuity ... there is a "movie" in my head all the time ... and it can get triggered a lot of times by music, which is one of my biggest sources of livelihood.
But what comes out ... that's another story, and my thoughts are that you MUST let it all come down, regardless, without thinking of anything mechanical. In other words, let it flow until it's done and over. WHERE, this process gets hurt the most, is when you stop it all the time, and then wonder why your intuitive side does not work ... because you stop it too many times! And you end up "intimidating" it.