i understand much of your situation re dual diagnosis. i did "commit" myself for help cause i was failing over and over again...abusing alcohol to self medicate while also being bipolar 1. the combination of both is a dangerous mix as you know. i became hopeless, real hopeless and knew i needed to take myself out of my environment completely to hopefully succeed so i would have a life, literally.
they suggest in AA we need to avoid ppl, places and things. your ongoing attraction to the ambiance would definitely be a ppl, place and thing you are longing for. imo moving back would respark your attraction to the alcohol and drug use. it would only be a matter of time before you would use i feel. there's a saying, blind ppl don't go to the movies, just a figure of speech tho. alcoholics are encouraged not to go to bars. same reason. i feel it would be setting you up for another downfall.
please keep in mind this is just my opinion. you can create a new life if you are willing to go to any length as many of us have leaving the past the past. the reason you are comfortable to the alluring ambiance is you've lost the feeling of normal. that can evolve over time as long as you don't put yourself in the frying pan again.
i wish you well. glad you posted.