Have you ever tried the Pomodoro Technique? The Pomodoro Technique(R) - proudly developed by Francesco Cirillo | Cirillo Consulting GmbH

I've had a lot of students find success with procrastination by using it. And I've used a modified version myself when I face writer's block. The key for me is that it seems to take the pressure off the task and any feelings about achievement, by instead focusing on the control of time. At first I had sessions of no productivity--blank page. But I stuck to the time schedule, took my breaks, etc. Within a fairly short time, somehow the pressure went away, and I started making progress.

I don't generally need to use the method strictly now, but can go back to it if a task comes up that I have anxiety about.