I am DID also struggel with addictions. Anyway I don't know how your T is helping but our T has talked to couple of ours who have had their reasons why they do what they do. It hasn't solved the problem totally but atleast there's been progress. I use to get so upset with myself thinking I should have more control. I realize (on the good days) beating up on self acomplishes nothing.
Another thing you may want to consider is treatment and/or detox. Being under dr's, nurses and assistants care and watch can help with the problem of others sneaking to get more and atleast get you through the physical addiction. It's just some ideas to ponder and talk to your T about.