Addiction is a health condition involving the brain, the body, and the circumstances a person is living in. It frequently grows out of trauma, untreated pain, grief, and mental illness. Naming that is not making excuses. It is describing what is actually happening.
Evidence based treatment exists and it works for many people. That includes medical care, medication for opioid and alcohol use disorder where a clinician prescribes it, therapy, inpatient and outpatient programs, peer support, and harm reduction services that keep people alive while they are still using. Deciding among these is a matter for you and qualified clinicians. This page does not give medical direction and no parish or volunteer should either.
Nobody should tell you to stop your prescribed medication in order to be more spiritual, more free, or more trusting of God. That advice is dangerous and has killed people. Medication for a substance use disorder is treatment, not a substitute addiction, and the Church has never taught otherwise.
Faith can genuinely help alongside care. Prayer, the sacraments, Twelve Step communities with their own long spiritual tradition, and an honest relationship with God have carried many people through recovery. They work beside treatment rather than in place of it.
Relapse is common and it is not apostasy. If you are using again after a period of not using, you have not forfeited God, the sacraments, or your worth. Return to care, and return to prayer, as many times as it takes.
If you are still using and not ready to stop, you are still welcome to pray, to read, to attend Mass, and to be treated with respect. Staying alive is the first goal. Everything else can follow.