I take it your doctors haven't been able to suggest a cause?
In any case exercise is good for everybody, including diabetics, and I personally have noticed a big improvement in my health since taking much more exercise about ten years ago. At the time, a congenital back issue was giving me pain if I stood or walked for more than 30 minutes and a back surgeon said that he could operate, but there was a good chance that physio would work. Physio worked for me then, (lots of core exercises) and exercise has stopped a reoccurrence. So I am a big fan of physio if it is needed, and exercise in general.
Hopefully your physio will help you as much as mine helped me.