I know that if you give serana a potion of blood you turn into a vampire without warning. What if you didn't know this info before it's too late and you only gave her one and she chooses to use it while you're fighting Alduin and you're playing it on ps4 (autosaves) and you're fast traveling everywhere to try and cure it? I don't have a save before the fight and I've gotten pretty far into the game and would rather not start all over. Is there any way to get rid of the vampirism?

There's a quest in Morthal you can do to cure vampirism. Go speak to the Morthal court wizard, Falion, or talk to any any bartender in Skyrim to start the quest. You'll need a filled black soul gem so learn the Soul Trap spell then either buy a black soul gem from Falion or go to Fort Snowhawk. Snowhawk is full of necromancers that should have a black soul gem. Just use soul trap on an enemy and return to Falion.


The Elder Scrolls wiki has a walkthrough. Quest is called Rising at Dawn. Can't link to the wiki page because I'm still a new member here.

You have to become a normal vampire and then cure the condition. Serana can turn you if you've completed the Dawnguard questline. You can also fight vampires until they infect you.

I think the OP's problem is that Serana drank the potion and became a vampire, presumably after he/she had her cured. Serana's cure dialogue only shows up once so she might be stuck as a vampire for good this time. There are probably mods to fix it but whether they're available on PS4 is another matter.