The following resources may be of help to you:
Parkinson's Foundation Wellness Series: Navigating Change & Loss in Parkinson's Disease
How Do I Know I am Getting Better
Dealing With Grief - a set of videos created by the Association of Professional Chaplains
Horan & McConaty's Griefwords Library
Center for Loss & Life Transition
Pathways Resources
Open to Hope
Grief Reactions, Duration, and Tasks of Mourning
Knight and Gitterman 2018 Ambiguous Loss
HEALING Milestones What Grievers Can Expect with Covid-19
These books may also be of interest:
The Other Side of Sadness: What the New Science of Bereavement Tells Us about Life after Loss by George Bonanno
Option B: Facing Adversity, Building Resilience, and Finding Joy by Sheryl Sandberg
See also our Resiliency and Coping page