That sounds like what it would be. Odd that every single one of them is affected, though; that would mean you have multiple diseases, since no one reduces all of them at once. Press "i" and click through the first thing that pops up, and a second one will come up that tells you if you have a disease and, if so, which one(s).
EDIT: Looking at UESP, there's two, cholera and leprosy, that drain all of them. Definitely want to get those cured quickly, too...
Good heavens. My first EVER quest this time around and I get cholera and/or leprosy? Man... This is gonna be a long ride. I had to dump all of the excellent armor I found and can't collect any more gold (I had forgotten that gold weighs and didn't put what little I did have in the bank before I set off).
When you go outside the dungeon, does it reset? Seems to me the first time around, I got a wagon that I could go outside the dungeon and dump loot into. But Like I said, it's been a LOT of years ago. 15?