So it’s not a corneal ulcer. After more than an hour of waiting – time spent perusing my Vietnam travel book – I finally got in to see the eye specialist this morning. She took one look with her microscope and decided it wasn't an ulcer. She simply found and removed a foreign object from my eye.
So now, instead of needing steroids, she simply has me on some mild antibiotics to make sure the site doesn’t get infected while it heals.
Yay – I’m ulcer-free!