morrow man

Firstly when you get a disease called porphlymic hemploria or something like that after a few days off sleep you will get a message saying you saw a girl and you drank her blood or another message like that every 24 hours you will become more blood thirsty and will become stronger and more weaker to fire and the sun. Ok I have a question now. In the thieves guild on the second mission from seeing the gray fox personaly you have a task to steal the arrow from the bravil wizards grotto where is the key to the door inside the grotto I have been stuck on this for days lol someone help.