Well, for starters, get another headmaster, just kidding. ptsd is good for procrastination, I know, I am a professional procrastinator of late. aka late due payments.
Force yourself to do what you have to.
1. gather the papers together and set them at a work station, like a desk or table.
2. take a break
3. get a beverage and organize your papers
4. take a break
5. start to get the first page ready
6. take a break
7. do a task and take a break
8. see # 7
after you know it will be done.
Hope it helps