Writers block is all too common for anybody who writes. Fortunately, science is here to help. I just stumbled on a wonderful, brief classic paper on the failure of self-treatment of writers block, published in "Journal of Applied Behavior Analysis" in 1974, and freely accessible here. Go on - it's an easy read for non-specialists.
Of course, a lot of psychological research used to be focused exclusively on northern Europeans and Americans. We know better today than to generalize results from one culture to others, so a group of researchers have replicated the original study from a cross-cultural perspective here.
I really have to find a way to cite either study in my next paper.