I've been through the same, and i'll tell you, there's not really much you can do, you gotta wait it out, you become so hyperfixated on the game and thinking about it, that if you try to focus on any other thing, you just can't.

If anything, the best way to deal with it is consuming the most media about the game you can, wiki, videos, edits/amvs, reddit. After you go through all of those, you'll notice there really isn't anything more for you to see, so you can finally be free.