You are suffering from uncontrolled diabetes
There can be various causes for your back pain which includes arthritis,osteoporosis
,dibetic neuropathy,obesity,myalgia may be due to use of anti cholesterol
You require a thorough investigations to look into the cause for your back pain.
Since you are suffering from diabetes for past 15 years,the oral anti diabetic drugs seem to be loosing their efficacy in you and this happens because of progressive destruction of beta cells of pancreas ( responsible for production of insulin ).
Your doctor has added ISTAMET in your prescription which is a newer anti diabetic drug.
It has to be seen whether your sugar levels get controlled with these oral drugs for diabetes.
Failure to respond to oral drugs,you may have to be put on injection insulin.
Be regular in your visits to your doctor and if your sugar levels remain uncontrolled,don't headirate o go for injection insulin.
It is very important to control your sugar levels meticulously to avoid future complications.
is a B complex and has been prescribed to take care of diabetes associated neuropathy.
Do regular exercises and reduce your weight as this would not only help in better control of sugar levels but also help you n your back pain.
Get your VIT D levels also checked up.
Do take calcium supplement
as diabetics develop calcium deficiency