happened to me a few times. I always figured it was a Drain Magicka enchantment.... might well have been since i did manage to pull my ass out of the fire and escape death. but i was literally taken down to like 1000 magicka, which i was suspicious of.
Has anyone encountered something similar to this in Cyrodill, where your health bar will never completely refill? As far as I can tell your health IS full it just seems to be a display error but as you can imagine it's extremely off putting with the consoles percentage-less UI.