My SO whose CPTSD came to light after 25 to 30 years of marriage also started having alcohol abuse issues after 30 years complete sober. She had exhibited questionable behaviors for years but was high level functioning, with CPTSD lurking right below the surface all those years. Yes, there were horrible trust issues, anxieties, etc, but both of us having a strong belief in the sanctity of marriage stayed together, somehow. Anyway, my SO is managing with the help of wonderful counselors and Doctors, even though it took years before she could trust them enough to be honest with them. For the substance abuse, which is the subject of your question, she found help in group counselling and her Dr. prescribed some meds commonly used to assist patients in battling the urges of substance abuse. I urge you to see a Dr. and be honest with them about your struggles and desire to stay clean. I hope my post is not offensive, and thought you might like to know there is hope.