Dear sir
Is your
diabetes in control ? And how long you are suffering from diabetes ? And Long term complications of diabetes may include changes in connective tissue that occur as a results of high glucose levels sir. And it will cause inflammation and capsule stiffness, when you move your shoulders at stiffness period then it may cause restricted painful movement. Nothing to worry.
Next Steps
Now keep hot and cold pack. (that is 1 minute hot pack & remove it and keep 1minute cold pack ) like this 10minutes 3 times a day to reduce your pain and stiffness first.
Health Tips
And try to do all shoulder movement with support of other hand and some shoulder free exercise example rise your both hands up and down, raise sideways then rotate your shoulders clockwise and anti-clockwise. if any doubts or queries u can contact us. thanks