Ancient Artifact's poem describes the strange quiet that comes after feeling too much for too long. The speaker says that after "years / and years / and / years" of emotion, something simply shut off. The short, stretched-out lines at the start make the time feel heavy, as if the speaker is wearily counting it out.
The comparisons that follow all say the same thing in different ways: a flipped switch, feelings "poured out 'til not a drop was left," a heart in a coma. That last image is the sharpest. The heart is "beating not living," so the speaker is still functioning but no longer truly alive inside. The title, "Comfortably Numb," adds a bitter note, since the numbness may bring relief from pain but also costs the speaker everything else.
The mood is flat, tired, and quietly sad. What stands out is the speaker's doubt that things will get better. The poem ends on the lone word "life," set apart on its own line, as if it is something far away and hard to reach.