First, let me say, I am so sorry you are going through this. How is the addiction? Are you clean? That's the first step. If you are actively working on that, you will then have a better chance to reunite with her. Usually addiction has a mental health component, be it depression or anxiety. Treating this as well is very helpful. And offering to do therapy, alone AND as a couple. these things could greatly impact the outcome. You have to work on yourself first. Then you can work on you two as a couple and as a family.
Please know that people care. Do you have AA in your area? A sponsor, meetings are essential. Do you need rehab? I'm not sure where you are at with the addiction and more info would help. MedHelp has an awesome addiction forum. Here is a link: https://www.medhelp.org/forums/Addiction-Substance-Abuse/show/77 I
know some of the people over on that forum and they are terrific. Many have been through the same thing as you. Please write on that forum for support too. Wishing you the best and we are here for you. hugs