If Raj hasn’t hit rock bottom yet, he will now.  Poor Raj (Kunal Nayyar) has often bemoans about being the only single one in the nerdy bunch on “The Big Bang Theory.”  Sadly, his depression will more than likely triple as TVLine.com reports that Howard’s unseen, but woefully unattractive mother is getting a boyfriend while her son's BFF still can’t talk to the fairer sex without pounding cocktails.  “Buffy The Vampire Slayer’s” Ken Lerner has been cast as the (un)lucky dentist who woos the still unseen Ms. Wolowitz.