I don't remember hearing of it, but I've looked around and, you're right, very little mention of it. This was about all I could find:
www.imdb.com
It says it was a short film (14mins) from 2013. The subject matter sounds very interesting and I'd quite like to see it too. I expect it's like a weird little art film.
It might be possible to contact the makers themselves to ask them directly if you wanted to pursue it. I took a quick look on Angela Christofilou's website and she seems like a very creative person.

The Blow of the Void (Short 2013) - IMDb
The Blow of the Void: Directed by Angela Christofilou, Nik Voigt. With Angela Christofilou. The Blow Of The Void takes us on a journey exploring the conflicts of a troubled mind. The film takes place in just two locations and shows one person's effort to understand the relationship between the...

It says it was a short film (14mins) from 2013. The subject matter sounds very interesting and I'd quite like to see it too. I expect it's like a weird little art film.
It might be possible to contact the makers themselves to ask them directly if you wanted to pursue it. I took a quick look on Angela Christofilou's website and she seems like a very creative person.