Carr wouldn't voluntarily go for therapy, but Kris might? He's Ebony's, so you'd need to ask her :)
I haven't actually worked out where he works, I should definitely do that before bringing him in, hee!
Carr loved to read, but used bookshops are a bit of a painful subject - Mel's family owned one, Mel and he ran it for a few years.
And yeah, it's entirely possible - Nathan ran Caleb's club in New York, which was definitely vamp-centric, so it's probable that he met them at least in passing :)