This art film is literally pretentious nonsense

Before anyone throws stones at me for criticizing Melancholia, learn that I am a film-geek (watched over 1000+ films), I love fantasy & philosophical films, I've watched a few other Lars Von Trier films including Nymphomaniac and I actually liked a couple of them, I am aware of Von Trier's avant-garde filmmaking style and his mental health issues, I am a sufferer of a mental health condition myself, and I have a degree in philosophy; therefore I am not a layman and I am used to esoteric works. HOWEVER, for the life of me, I could NOT understand what Melancholia was actually about! Although the majority of information on the internet hints at being a metaphor for depression, this film does not merely conveys the struggles of a depression sufferer and its consequences. Justine's mental decay is obvious and Von Trier included in her character some of his own depression symptoms: loss of taste, sleepiness, sheer calmness under stressful and heavy pressure situations etc. If the film had stopped there in terms of plot, it would have been an understandable drama about a woman going through some mental difficulties. But the inclusion of a fictitious planet colliding with Earth and killing everybody - event that has as side effects: heavy breathing, suicide, laying nude on a rock and touching yourself in the middle of the night - is so nonsensical, illogical, absurd and far-fetched that it completely transforms the whole plot and it shifts attention from Justine's condition to astrophysics in a way that few would understand. It's like what the Star Wars version of Titanic would be like, or something like that. By that, I mean two completely unrelated topics put together in a film neutralizes the potential of it. Not only Melancholia is not linear, but it proves to be so out of order it makes the watcher frustrated and exasperated for it to be over.

What did YOU understand about Melancholia?