Read my post, think it’s the first one. My husband and cocaine. It’s awful!
There is nothing you can do. Their brain has now been altered, my story very similar to yours, but worse in ways.
Go to al anon, this is the first step! Seek help for yourself. By building yourself back up will help you to see how crazy your life has become and unmanageable. It will restore you to sanity which will then empower you to deal with it better.
This then usually improves the situation with the addict. But your main concern needs to be to focus on you. X