It seems you are suffering from cervical spondylitis
Get an X-ray spine done to confirm it.
As cervical spondylitis is age related degenerative disease,treatment lies in strengthening of neck muscles by doing exercises and relieving local muscular spasm by local heat.
Consult a physiotherapist for proper management and treatment.
Take care of your VIT D and calcium levels as well.
Keep tight control of your diabetes
Do regular exercises and do daily stretching of your muscles.
If you have any breathlessness or palpitations ,then get a cardiac clearance from your cardiologist as well.