You need a potion of cure disease as soon as you get infected, but there is a quest that removes vampirism, i just forgot wich. When you turn full on vampire lord people will attack you on sight there's nothing you can do about it, but if you have Skyrim Legendary and download the DLC it fixes this problem and people will no longer attack you.
I also forgot to mention that becoming a werewolf removes vampirism as well, but then you're stuck as a werewolf at least until you finish the companion's questline and get the option to turn back normal.