I am playing Dragonborn DLC. I am currently going through one of the black books quests and even though I am not fighting my health bar keeps going down. I can heal back up to full again but it keeps disappearing. If I do not heal I will die in about 30 seconds.
I have no disease or nothing is visible anyway, no clue as to what's wrong. I can leave the black book quest or fast travel to a different location or rest for 24 hours but still the health disappears.