rubatosis
The unsettling awareness of one's own heartbeat
uncountable
Amador rocked me slowly in that amniotic tranquility and I started to get sleepy. I could hear the unsettling rubatosis of my beating heart.
Where it comes from
Presumably rubato + -osis. Coined by American author and neologist John Koenig in 2012 as part of his Dictionary of Obscure Sorrows project.
Adapted from the Wiktionary entry rubatosis (CC BY-SA 4.0).