Getting over writer's block in a paper…a couple helpful tips…
Find a new setting! Sometimes just sitting in the same place writing for a long period of time can be very boring and put up a wall in your brain.
You can also try doing some kind of physical activity... jumping jacks are an excellent way to get the blood pumping and physical activity is good for brain activity, this help your brain stimulate some new ideas!
Take a break! Maybe just getting a bite to eat of watching a twenty-minute TV show will give you the mental break you need to really start up again strong with your piece of writing.
Get out a sheet of paper and just brainstorm! Write down anything you can think of that has to do with your topic, whether you think it is good or not, just putting your ideas out there can help a lot!
Hope this helps!