I am sorry that you are suffering. You are going through the grieving process, grieving what you lost. The only way I know to combat this depression is to get back out into the world. Meet friends after work, take up a new hobby, visit family, join a health club, walk around the block....just do something.
Talking to her, hearing her voice is not helping you one little bit, I cn't stress how important no contact is to the healing process. Please consider going no contact, if she really does straighten out in the future (a year or so) possibly you can start talking to her again.