Grief can manifest itself in many different ways - physical symptoms are just one of them.
I remember the relentless fatigue I suffered from grief.
I was afraid to sleep because I would dream of loved one, and then would awake restless and suffering.
I didn't have energy - was that because I couldn't stay asleep? Or was it because I was just depressed?
The less I did, the less I wanted to do.
It took me quite some time, that my grief was affecting my physical ability to "do life".
Dr. Shear's work (in attached article) helps us to see that grief affects every single body part. She states:
Recognize that your pain is normal.
Approach your physical symptoms of grief with curiosity and self-compassion.
Embrace gentle movement.
Talk to health care provider about any concerns.