If you are struggling to make a start on your next assignment then why no try starting from the end?
Lay down the conclusion and see if you can build your essay around it. Maybe you have a clear conclusion in mind and argument you have already analysed but have not written about. Well then you could try putting together a conclusion to help you construct the rest of the essay.
As with any written task often the hardest part is getting started. Starting from the end can help you take a new approach and get some momentum.