Yeah, I'm also stuck as a vampire and Aela won't turn me back, the first time she did there was NO message that it was a one-time deal, and I didn't have any saves left to revert back to by the time I'd discovered it. nearly 300 hours and 3 expansion packs invested into the game and I'm considering starting over because of it. Being the vampire lord is by far cooler than being a werewolf, but when you're in dragonborn status, the vampire blood sucks, whereas the werewolf blood actually has some cool perks. I think you should be able to switch back and forth as you please, so long as you're willing to jump through the hoops, but at the very least there should have been a message saying Aela wouldn't change you again........ PISSED.