Writer's Block

Do not confuse writer's block with other emotional states that interfere with your writing such as anger, grief, illness, laziness, horniness, and so on. True writer's block has four primary causes: not knowing your characters well enough, trying to edit and write at the same time, fear of failure, and fear of success. . . .Trying to write and edit at the same time creates class-two writer's block. When you write, you have to first draft your novel without worrying whether every I is dotted and every t is crossed. The manuscript isn't going to be perfect; it's only a draft.

FROM James N. Frey on writer's block in HOW TO WRITE A DAMN GOOD NOVEL