I sympathise. I am also stuck. One of the scrolls suggests you head to the dungeon. I think there are some stairs near the chest of quest stuff, which leads to a door to the dungeon, then there are some more steps down and you will overhear a guard torturing/questioning a prisoner. I watched them for a while and when they didn't go away I killed them both and rescued the prisoner, except now he is cowering near a trapdoor that requires a key which I can't find. And it is impossible to get back to the outside world. You are going to find it hard with the guards chasing you, your only choice is probably to try to outrun them, then sneak in a dark place, and hope you become hidden.
Hm, in my save after I had killed the torturer + guard, two new guards appeared from upstairs holding the dude who helped you in the beginning prisoner. I killed the two of them and both had the trapdoor key in which you can escape

Be careful of the troll down there btw..