Prisoner of Blood Series by David Dvorkin

PRISONER OF THE BLOOD VOLUME I: Seduced and killed by a beautiful woman, Richard Venneman woke as a vampire. Because he loathes what he's become, because his irresistible need for human blood horrifies him, he seeks the only salvation he can imagine — Incinerating himself in the experimental fusion reactor where he worked when he was alive.

PRISONER OF THE BLOOD VOLUME II: Richard Venneman used to be a vampre. Now he has become an even more hideous monster — a monster who preys upon vampires.