Grieving the loss of control
Losing someone or something important to us brings home the fact there is much in life we cannot control. Control is something we thought we had, but ultimately there are many things in life we cannot control. We must grieve that sense of loss, but not dwell in it, which leads to anxiety.
Turn your focus on things you CAN control. There are many things, including how you think, where you place your kindness, and how you care for your body. You will be amazed and empowered by focusing on things you can control.