Healing from unresolved grief and any trauma related stress starts when we acknowledge the loss and accept the loss. Part of acceptance means letting go. Share your story with someone who you can trust, but then take it to God. Tell God exactly how you feel. Ask God to bring healing to your unresolved grief, and help with moving on with a new life. You are not betraying your loved one if you move on with your life, and it does not mean that you do not love them.
If you are the parent or care giver of a child with ADHD or PTSD, or an educator then knowing how to manage meltdowns can make a big difference for both the child and yourself in keeping calm.