Welcome 498k - So sorry for what brings you here. My husband is a heroin addict, not coke, but I am sure only those details in our stories are different. The resulting pain and trauma are the same.
Are you receiving treatment or seeking support for yourself? Reaching out here is a huge first step, so good job with that! I have a feeling you will get a lot of support here. But, I would first and foremost recommend reaching out for support face to face. I promise, coming from an introvert, it is not as scary as it sounds. The resulting peace, hope, and support you get from surrounding yourself with others who get it is irreplaceable. I would seriously suggest NarAnon or AlAnon, or reach out to your church or a local church. Those are two places that were crucial in my care.
Keep posting here, and remember, you are not alone.