When I have a project that has to get done, I have a tendency to want to work on it nonstop until it is completed. I found that I actually have to stop myself after a few hours so that I don't burn out. In your situation, I would probably schedule a chunk of time each day to work on the project(s), and treat it like an appointment. Where the rubber meets the road, you still need to sit down and do the stuff, so for a big project, scheduling the time to "ABC" (Apply Butt to Chair) and work on it makes sense.
One thing you might consider during your scheduled blocks of time is writing down next actions that might break your concentration while you're working. For example, you're writing a document and you have to check a fact with a coworker. Rather than getting up to go talk to them, which might lead to further distractions, write that down as a next action item to process after your scheduled time. I know that technique helps me when I'm in the flow of something creative and I don't want to interrupt my train of thought.
Let us know how it goes.