Yumbo

A broad term involving the 'ESSR' principle, consisting of 4 aspects - Emotional, Sensory, Social, Routine.

This can be described as a feeling of 'incomprehensible dread, muffled enough that it does not drive you mad but loud enough that you feel despair.'

Person 1: Bro, ever since Autumn started, I've been feeling quite Yumbo.
Person 2: Tf you mean Yumbo?