well.. don't quote me on this, for i haven't played that part of the game in a long time, but if i'm right, as soon as you walk outside, there should be a whole pack of werewolves killing the people standing outside.
*****SPOILER*****
Spoiler is written in black, just high light it to read it
At this point you are bitten (after killing all the wolves) your choices are to just ignore it and become a werewolf your self and finish the Hercine Main Quest (I strongly recomend you don't) or use a potion of cure common disease and continue on as a normal person in the main quest.
So my guess is that your problem is just a glitch, so just load a file up from before this incedent.
Glad I could help
