Well that's unfortunate... I really hope you don't play on the PS3.
Anywho, you wouldn't have contracted from the Anvil House quest, you must have been in a cave and contracted
Spoiler Porphyric Haemophillia from a Vampire you were fighting.
http://uesp.net/wiki/Oblivion:Vampire_Cure
Oh dear. You'l need to go back to an earlier save before you became a vampire and pray at a chapel altar then
See http://uesp.net/wiki/Oblivion:Vampire_Cure#PS3_GotY_Vampirism_Cure_Notes