Healing is a process.  If you have a deep wound to your body, it is not "healed" in a moment, by a doctor cleaning the wound, putting in stitches, shooting you full of antibiotics.  It takes time and sometimes it takes many steps to reach a cure.

I have a cousin who spent years reaching some level of acceptance after the death of her only child.  She did it primarily by having a group of other parents who had been through the same thing she could talk to, trust to understand, and give her own comfort to when they were hurting.  She learned to share her pain and the pain of others and all were helping each other by doing that.