The first two are "no." The reasoning is that losing the only thing that makes you better than a monk is a punch-the-DM offense. Unless of course the two of you agree that the Cleric becomes Evil and begins worshiping a new (Evil) deity.

Technically, though, if the Vampire that transformed you can't control you, but you have free will, you've pretty much got whatever alignment you would have if you weren't subject to supernatural compulsion.

Depending on your deity, you might accept your transformation (i.e. if you were a follower of a Neutral or Good-aligned deity with things like the Moon or Death in his/her portfolio), or you might seek death and resurrection (especially if you were a Pelorite).

Most nature, life, and solar deities have a stronger dislike of their worshipers remaining undead (solar deities disapprove of vampires especially and possibly specifically), and some death deities despise intelligent undead, but others use them as psychopomps. Most other portfolios are neutral towards the issue. Good deities are opposed to the "run on negative energy and the blood of mortals" bit, but generally recognize that an intelligent undead can be a powerful force for good.

If you aren't needed as a band-aid box, you and your DM might consider switching your spontaneous casting to Inflict Wounds, but there's no RAW support for doing that.