Christina Applegate confessed her multiple sclerosis has robbed her of being able to “enjoy living,” RadarOnline.com has learned. In an emotion interview on Tuesday’s edition of Jamie-Lynn Sigler’s MeSsy podcast, the actress opened up on the “real depression” of her health battle. “I’m in a depression right now, which I don’t think I’ve felt that for years,” Applegate told Sigler. “Like a real, f—-it-all depression where it’s kind of scaring me, too, a little bit because it feels really fatalistic. I’m trapped in, like, this darkness right now that I haven’t felt [in], like, I don’t even kno…