When I traveled to shadow world with vampire girl in order to find missing Elder Scroll, I chose to becoma a vampire instead of filling a soul gem with my soul. Now I'm a vampire, but I want to become a werevolf and recieve werevolf perks. How can I do it?
Posting this because not sure if forum threat "http://www.gamesas.com/topic/1412136-can-i-become-a-werewolf-if-i-am-a-vampire-lord/" is about my exact case.

Pretty sure if you just do the Companions quest which turns you into a Werewolf you'll be cured of your Vampirism and become a Werewolf.

This, or if you've already gone through the Companions questline, go to Aela and she'll give you one more chance to get werewolf blood.

I'm a werewolf fan thru and thru but I also decided to become a vampire temporarly for the same reason, to enter the soul cairn. But I figured, since i'm the dragonborn and I have absorbed approx 80 or so dragonsouls, plus my own which is supposly pretty strong itself, would trying to partially soul trap a soul like that not like trying to strip the copper tubing out of an atomic bomb to sell for scrap metal? Seems like something terrible could go wrong at just the idea of it.

But yeah. max out the vampire perk tree, get the achievement, go talk to Aela and she'll make you one of her sugar puppies again, or a first time if you haven't already done that.

I found it better to just have your soul trapped and you can do a quest in the cairn that lets get your magika/health/stamina back to full while in soul cairn from then on. Just for future playthroughs if you don't want to be a Vampire at all.