My recipe:
1. Split your work into tasks. They may become hundreds, but don't worry. Describe them on a paper, or in a todo app.
2. Pick ONE suitable task for the moment.
3. Write it down on a piece of paper and put it in front of the keyboard. Close the todo app or push out of sight all other papers!
4. Prepare your workstation - open the IDE/text editor with the needed files open. Open the browser on the page you'll be working on. (I'm a web dev)
5. Go for a short walk or sit down in a quiet place. Leave all communications behind. NO DISTRACTIONS!
6. Start staring at something relaxing - trees, birds, 24h nature channel
7. If there comes a thought about the chosen task - write it down on a piece of paper
8. IMPORTANT: If you start thinking about the other tasks push the thoughts aside - "They are for later, they are written down. Now back to the current task."
9. After 10-15 minutes of relaxation return to your workstation. Look at the piece of paper and start working on the task.
10. When the chosen task is done go to 2.
After finishing a task reward yourself mentally and physically. When you are in your relaxation place say to yourself "Task done - good job from me", and give yourself a treat - something you love - something sweet, cigarette or a Cuban cigar if a big project was finished.
The workstation and the place for relaxation must be two separate places - this creates different brain moods, and this is important.
I think that the quiet relaxation and pushing aside the thoughts about the other tasks are the key moments in my improvement. Now I can make up to 5-6 fruitful hours of work a day.
I hope that this will help to someone with the same problem.
