It may help to go out and do something else that you enjoy, to stop thinking about all this. That would give you some perspective on things and you can get back to your work with a fresh mind.
Also sometimes when you procrastinate it's an indication that what you're doing is not really what you want to do, so you might want to consider doing something else that you can be passionate about (not saying that's easy and you talk about assignments, so you probably don't want to drop your degree out of the blue).
Also sometimes when you procrastinate it's an indication that what you're doing is not really what you want to do, so you might want to consider doing something else that you can be passionate about (not saying that's easy and you talk about assignments, so you probably don't want to drop your degree out of the blue).