the corner of the student union

Working in a school, where the students stay the same age and I get older, has given me an odd sensation. Even while sitting alone at a table in the corner of the student union working on coffee, my physical body is slowly drifting back from everything before me while my view is magnifying to a greater extent. I've been double-crossed by a seemingly good-hearted mentor, who inspired me enough to take up teaching, and a feeling of dread is working its way up my back, straightening my spine and fusing all its joints. I turn my neck to look behind me and there is nothing. The world is falling into the back of my head, which is now unbearably heavy and pressed sideways against some stone pillar.