It can be very overwhelming to write a dissertation or thesis. Try to get a hold of a thesis from a successful student at your institution, as looking at how others have set up the dissertation and the format is very useful. You can also obtain dissertation samples from a reputable source. These dissertation samples can serve as a useful guide on how to write your own dissertation and help you not to feel so besieged.
The completion of any thesis or dissertation can be viewed as a journey. As with all journeys, getting started can often be the most difficult and frustrating part. Thousands of students have been in your position; staring at an empty page waiting for inspiration that never arrives.