Without a doubt, how you constructed the introduction was quite beautiful. In fact, I actually googled "Dubois Again" to check if it their was actually a production of such a movie. Perhaps that was an illusion within itself? An eloquently done one in fact. Though, minor technicalities of "A year-long examination concluded that Ms Reid suffered from a mild case of schizophrenia, characterised by her seemingly ‘inaccurate’ take on reality, and a severe case of grandiose delusionalism, an illness typically exhibited by a sufferer who does not have insight into their loss of touch with reality; both resulting in an addiction to alcohol." Here, the sentence is too long. However, this could be caused by the wordy "insight into their loss of touch with reality; both resulting in an addiction to alcohol." Either way, fragmenting it it perhaps will make it appear more simpler. It just didn't ring, expression wise.
With the crux of your dialogue, the only concern I had with it, is the use of "illusions." Perhaps by using it so much, it indicated your insecurity? Lack of definition and an attempt to try and impose "the essay topic" on the readers? To recognize illusion as a multitude of things. But illusions can be replaced by other means like "world, universe, imagination, perception" and various other ways in your repertoire.With subtleties to illusions, this would have lifted your piece of writing, engagingly and expressively. It would also have provoked your readers to think, making your idea appear complex but at the same time, not complex. You are merely just interchanging words, but they provide different insights and images. For example, by changing "illusions" and "world," you are inviting your reader to explore a bigger picture of fantasy and imagination. Isn't that what illusion is all about? The ability to create and to make it appear true.
Of course, any other concerns/disagreements/agreements, feel free to post back.