It's good that you're seeking therapy and addressing the issue! Big steps!
I have a friend who had to literally get rid of his PC because of his OCD issues over things. He's been doing much better, I'm not suggesting that will help you but it helped my friend who couldn't stop certain behaviors.
I also had kind of the same weird obsession when I was playing FFXI, I really needed to quit so I gave my character away, one that I had progressed on for 10 years. Deleting it wasn't enough because I knew I could get it restored.
Just don't feel alone, social interaction in gaming can be very addictive for some people but again, I'm glad you are trying to help yourself! Best of luck