How do u get him to change his mind?

I've been married for 8 years. We've been together for 13 years. Throughout our lives together I have suffered off and on with depression and anxiety, not really knowing what the problem was. He was always asking what's wrong? And I would tell him I don't know. Its not u its me. After several years of pushing him away due to my depression he said he has had enough and that he wanted a divorce. I woke up. Trying to keep my marriage together with this second chance, but still didn't have an actual diagnosis as to what was wrong with me. Things started to get better then the depression got worse. Second chance gone. He has closed me out the way I had for so long. I have been diagnosed with severe clinical depression and anxiety disorder. Now taking medication and I'm getting better. He sees that I'm getting better but doesn't want to let me back in. Help!