In fact, I'm unable to do anything other than move, feed, and access the perks display when I'm in Vampire Lord form. I'm certainly not able to return to my human form. Of course, this could be because I was unable to find any documentation that gave a list of what buttons on my controller get changed when I go into Vampire Lord form, so if that's all it takes to solve this problem, I'd truly appreciate if someone could point me to a place where I can find the information. I've already searched uesp.net and didn't find anything, so I'm up for searching other places.