Without disagreeing with anyone on here, I see something else going on also. While I wholeheartedly think that you should get help and do your part in fixing this relationship, I don't for a second believe that anyone is solely responsible for the deterioration of any relationship.

I know you only see one side, you see your depression and the way you treated her but the fact that you've tried making up, apologizing and aside from getting help have made attempts to make amends, your mother is now going out of her way to seemingly abandon you emotionally to punish you. Unfortunately you can't change that, I'll agree with the others, you're only in control of you. I hope she comes around as you get help but I just wanted to say that I feel for you and want you to know that her behavior isn't necessarily fair to you either. In essence, doing almost the same thing you did to her.

*hugs* I hope things get better for you.