Realize that research ability is a learned skill, not innate genius. If you find yourself seriously stuck, with nothing at all happening for a week or more, promise to work one hour a day. After a few days of that, you'll probably find yourself back in the flow. It's hard to get started working in the morning, easy to keep going once you've started. Leave something easy or fun unfinished in the evening that you can start with in the morning.
Fear of failure can make work hard.
The prospect of discovering that your last several months of work have been for naught may be what's stopping you. Read Alan Lakien's book How to Get Control of Your Time and Your Life , which is recommended even by people who hate self-help books. It has invaluable techniques for getting yourself into productive action. Most people find that their personal life and their ability to do research interact. For some, work is a refuge when everything else is going to hell.