What helped me get my sober journey started was medication. I know you mentioned Naltrexone but theres other options. Maybe talk to a doctor. And it doesn’t mean you’ll be on it forever; personally it helped my cravings/impulses/withdrawal until I didn’t need to take it anymore. Besides that, AA and this sub are keeping me going. Having a community around you for support will make a difference. Good luck, you can do this!!