Hello all, i do not feel that it is anything to do with your diabetes it is more likely a pinched nerve somewhere in your back or neck, we tend to show up with these sort of issues when you are in the same position for long periods, i would be contacting a chiropractor or bowen theripist if where m, over the years i have been a diabetic have had a few of your issues and seen on of the above and then i was back to normal, i have been a diabetic for 53 years, hope this may help.
Kind regards
Toby