hi, ive had a vampire dream once where i barely escaped death from a vampire..i think mine meant that i was exhausted and anxious. your dream sounds a bit like an anxiety dream but it also has the part where the woman turns into a vampire..i think that could stand for sensuality/attraction. maybe there is someone you find attractive but you dont know the person too well and worry he/she might turn out to be bad for you. the main theme of your dream seems to be transformation..and death or transformations usually stand for new beginnings. Maybe you are in a transitional phase right now or you feel like you have to make changes in your life.
I hope I could give some ideas