You may be experiencing symptoms of a condition known as diabetic neuropathy. What happens is if your nerves are destroyed by the overdose of sugar in your blood then it may cause pain in the blood and weakness in the body. Diabetes can cause pain in your joints. But you can control your diabetes to improve your health and doing so would prevent many other diseases. Stick to your medication schedule, learn how to balance your diet, and make an exercise routine that you are going to stick to.