My thoughts were Self-Esteem Supercharger, Anxiety Free and Positive Relationships would each help with grief.
In your situation you moved from anger to grief. So my intuition says Positive Relationship would be the the one to use.
Why? You don't know the reason and I did suggest it may not be necessary to know the reason to move on. Anger, often means you want to fend something off, grief is a personal hurt often a result of a loss. It may indicate that you did not have an ideal relationship with someone close, lacked support in a time of crisis. To heal that wound you would need to be able to support yourself. Be there for yourself because in the past the support wasn't there (it may be even you who goofed and you haven't forgiven yourself for that mistake). Remembered or forgotten your younger self was wounded and is still feeling the wound. Your current self needs to allow the wounded self to know it's okay, what ever happened in the past can stay in the past. Whatever wrong you or someone else did you have learned from and nothing needs to be made right, whatever you lost you managed okay anyway and there is no need to blame anyone because it just is as it is.
Support yourself as you would a child who did something silly, got hurt as a consequence and is laid up until the wound is healed. Be relieved because whatever it was, you survived.
After the Positive Relationship Session B, 1 to maybe 3 times, use the Self-Esteem Supercharger Paraliminal.
Alex