I love gaming too, and it was my number one distraction activity for dealing with anxiety, worked like nothing else, until about a year ago, had a breakdown and the anxiety was intolerable, I started avoiding playing games in case they wouldn't calm me down as effectively as they used to, the thought that my foolproof remedy might not help any more was just unbearable, I couldn't risk not having that hope any longer. Makes no sense whatsoever and became a self-fulfilling prophecy, even causing anxiety that didn't exist before.
I was doing some Graded Exposure Therapy for agoraphobia at the time and decided to use it to help with the video game problem too, started taking little steps towards playing again, chose familiar games, or new ones I was really excited about trying, stuff I knew would hold my attention, and began introducing them back into my routine slowly. The first few times I picked days when I was feeling reasonably good, and played 2-player with my partner (who is also my 'safe' person) I tried not to put too much pressure on myself, stayed away from online multiplayer, didn't make any promises to myself about how long I would play for, could stop at any time. For a while I thought it was causing vision problems and various other symptoms, but it did get better, which confirms to me that they were anxiety, and within quite a short space of time I was happily gaming again, I don't play as much as I used to, but that's probably a good thing :)