When it comes to that sort of addiction, "tapering off" doesn't seem like an effective solution. If you have a physical copy of the game, delete your characters and give it away (or trade it away) or just snap the disc in half. if its digital, delete your characters and then the game. The anxiety you have towards giving up the addiction is much harder to overcome than the addiction itself. Find some other games to play, or take a break from gaming altogether. If you really feel this is a problem, you've taken the first step already just by making this post. I had a similar problem just after TDB launched. I gave up for months and played single player, story based games (like you did with mass effect). I found the dark souls style games to be a blast. I still play Destiny now, but I don't do huge marathons anymore., and I keep a bunch of other titles on hand.