Suggest Treatment For Sciatica With Diabetes And Hypertension

I am an office worker 65 yrs weighing 65 KG with a height of 165 cms. for the last 25 years. I am a Diabetic since 1991.on medications since 8 years.I have mild hypertension which is controlled now. i have cervical myelopathy due to osteophytes compressing nerve roots at c3 c4 c5 and c6. I havfeel pins ande neddles over all limbs. Diabetic neuropathy was excluded after repeat Nerve conduction studies.Since an year I have pain over middle right buttocks .This is a deep boring and constant pain. I also feel dull aching pain over back of my left thigh ,outer aspects of left leg and outer boarder of my left foot. i consulted an Orthopedist .MRI of Lumbosacral vertebra was unremarkable. He diagnosed chr. bursitis and gave steroid infiltration when NSAID didn t work. There was no releief. A high defenition MRI with amarker on the site of pain was taken and it showed fatty ninfiltration and minimal atrophy of left gluteus medius and there was no evidence of any compression of the sciatic nerve. The doctor thinks it could be diabetic mononeuropathy but I get no releif. Medications I take: Inj Human mixtard 70/30 15 units Am. Glimeperide 2mg +Metformin SR 1g PM Pregabalin 75 mgs HS(since 6 years) Losarten 50 mg Once a day My fasting blood sugar swings between 135 and 150 and PP sugar between 180-200. I donot get adequate excerciise as I have pain left knee due to meniscal degeneration. Now my concern is about the ? Sciatica. I feel some weakness of the left lower extremety. What are the possibilties and how should I proceed further for a complete releif? Thanking you