I play wood elf, 50% resistant to disease and caught vampirism, took 6 of them, but they got me. I enjoy it, except when I forget to feed for 4 days and fast travel to the middle of town. 4 days no feeding you are attacked on sight. I also talked to someone in Solitude( I think) who told me about a wizard that studies undead that I should go see. Quest name I think is "rise before dawn" something along those lines, but I'm in no hurry to cure it. If you only have the first disease, couldn't spell it if I tried, you can cure that with cure disease, but once full blown vampirism sets in (3 in game days) you have to quest it away, or become a werewolf. As far as I know.
By the way Sun doesn't kill you at any stage in skyrim. Per stage it takes away a lump of health/stamina/magika and you do not regenerate any. So far going in to any dungeon/house considers me out of direct sunlight. So I travel at night, quest by day.