I'm trying to identify a story I read in the last 5 years. The central character was an alien who develops a microscope and remotely operated limbs so they can examine their own brain. They discover that thought processes are patterns of pressure differences and/or vibrations within the brain.
I recall at some point their realisation that this is why their people who run out of air supply, even momentarily, permanently lose their memories.
Towards the end of the story they discover that whatever they have been using as food (something that provides pressurised gas?) is slowly running out.