First, Welcome, mate <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />
Also the post might get moved but don't worry <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
Strange if you lose strenght every night: you're not supposed to, only 3 random points.
Try to reload. You have only 2 choices: you get the boy by sacrificing yourself OR you let the boy be killed and kill the vampire (you can use Telekinesis LVL2 on the lever or pick lock on the door). It can a difficult battle for low level characters.
Good luck. Post your results <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />