Alex
We are only going to be stuck here for awhile, not forever. You'll be able to return to your work eventually. Until then there are lots of people here that need protecting.
You overcame your addictions, you have the tools to make sure you keep yourself in check. Get those vampires to teach you how to keep control. If you ask me, they owe you at least that much.
If what they say is true and you need a human's blood to keep you alive....feed from me.