Author Peter Elbow argues that editing while creating sets the stage for writer's block. It is important for the you to clearly separate the two functions, you must remove the critical editor for creative writing of any kind. Don't concern yourself with structure, spelling or grammar. Let the ideas flow, get them down as fast as possible and never worry if what you are writing seems off topic, wild or silly. When far more words are down than you needed for the writing task, then you can let your internal editor start working.
Elbow further suggests that the most useful way to work out of a writer's block and to prevent them in the future, is to regularly spend three to five sessions per week in free writing. Free writing involves sitting down and writing, no matter what, continuously for about 15 minutes at a time. Ignore the rules, don't worry about grammar, and if nothing comes to mind, simply write the same sentence over and over again. Let one idea trigger another and don't try to be consistent or on topic. Eventually a writer can go back into the "mess", all those pages of apparently aimless free writing, and mine it for ideas or images. When moments of panic come along and writing seems impossible, it is not necessary to drag creative ideas out of nothing which can be very hard to do, instead search the free writing pages for inspiration and direction.
One of the best ways to both cure and prevent writer's block is to keep a regular journal, entering material at least four or five times per week. The only person who will read this journal is the future you, the you three weeks from now or 10 years from now, so there is no need to freeze up.
For a more thorough and deeply searching journal process, which has been used in therapy, Ira Progoff's Intensive Journal process and workshops may be the cure. The Intensive Journal workshops generally run two to three days and most of that time is spent in silence writing in an organized and deeply searching way.
Many writers have struggled with writer's block, and almost all of them agree that the real solution is simply to get started. Elizabeth Gilbert, the author of "Eat, Pray, Love", describes vividly how anxiety over trying to write a book as good a book as "Eat, Pray, Love" haunted her. Her analysis of creativity finally allowed her to separate herself from having to be brilliant. Instead she just had to show up and write. Writer's block can be emotionally draining but it can be cured with a stubborn determination to write. Write a lot and fix it up later.