To be honest, I don't understand "writer's block" at all.

When I want to write, I write. Sometimes the writing is great, other times less so. When that happens I edit or rewrite. On rare occasions I scrap the work and start again. Never do I think I can't write.

When a martial artist is learning a kata or form he or she is clumsy at first, slowing improving and getting better until the kata is mastered, or at least mostly so. At no stage does the martial artist think "oh, I can't move my arm" or "nope, kicking is impossible". 

We all have bad days, days when we're distracted or can't focus. But if you want to be a writer you have to write. If you are not compelled to write, feel the need deep in your bones, perhaps you should consider another form of expression.