The same thing happened to me with Mass Effect 1 and 2. I would want to nothing else but play those games and i went through the story line twice (paragon and renegade) and did everything possible on them. i spent all my free time for a month playing mass effect 2.
Mass Effect 2 is the most addicting game ever i have been playing it for a wek now and im not even haalf way done with the acuall missions because of all the side missions