The Fall of the House of Usher

which words relate to physical actions and behavior?

what do these physical details show about Usher's mental state and emotions?

And now, some days of bitter grief having elapsed, an
observable change came over the features of the mental disorder
of my friend. His ordinary manner had vanished. His ordinary
occupations were neglected or forgotten. He roamed from
chamber to chamber with hurried, unequal, and object-less step.
The pallor of his countenance had assumed, if possible, a more
ghastly hue—but the luminousness of his eye had utterly gone
out. The once occasional huskiness of his tone was heard no
more; and a tremulous quaver, as if of extreme terror, habitually
characterized his utterance. There were times, indeed, when I
thought his unceasingly agitated mind was laboring with some
oppressive secret, to divulge which he struggled for the necessary
courage. At times, again, I was obliged to resolve all into the mere
inexplicable vagaries28 of madness, for I beheld him gazing upon
vacancy for long hours, in an attitude of the profoundest attention,
as if listening to some imaginary sound. It was no wonder that his
condition terrified—that it infected me. I felt creeping upon me, by slow yet certain degrees, the wild influences of his own fantastic
yet impressive superstitions.