That's one of the effects of Cymbalta for me - and maybe others before that, I dunno. I've been feeling really slow, it was hard for me to wrap my head around stuff I was trying to learn, and rememering things was almost impossible. I'd chalked it up to just getting old and brain cells dying, until I went off the Cymbalta and suddenly I was totally sharp again. I can't wait to get that back when I finish stepping down from it.