A Shade of Kiev 2

There is much about my past that I have never revealed to anyone.
Nobody knows that, before I lost myself, I was a physician's apprentice.
I have witnessed countless human illnesses.
But I have lived for centuries and never come across a vampire being sick with anything other than his own darkness.
Until today.
I'm staring at my blood on the floor and a raging migraine is taking hold of me.
I'm not sure what to make of it...