Hi,
High levels of sugar in your blood makes the blood more viscouse (hard to flow) and it doesn't reach the tiny blood vessels (in many organs: e.g - eyes, kidneys, etc). It is common that diabetic people have problems with their blood circulation and that leads probably to the pains in your legs. Please get a medical check, make sure your sugar level is OK, do as much sport as you can (that is essential for you). Hope your colesterol level and your blood pressure are both OK.
Best regards,