I have pain pain in left leg. pain is going all the way on back end of the left leg. i also have tingling in left foot and toe.

Sciatica: This is what is commonly called sciatica but properly described as radiculopathy. The fact that it's distribution of tingling extends into the toe, it is likely either the L5 or s1 nerve root. (the great toe more likely L5 and the little toe s1). At 51, this is most likely the result of a disc herniation. Test yourself by trying to walk on your toes and heals. If you can do both easily, its good.

Have it evaluated: Your pain could be as a result of many different things. A thorough history and physical exam and possibly some laboratory and radiology exams are needed to determine the exact cause. Causes of pain may include: trauma (fracture, sprain, arthritis), infection, metabolic conditions (gout), circulatory, musculoskeletal or biomechanical abnormality and neurologic conditions (neuropathy).

Sciatica: This type of syndrome is usually due to pressure on a nerve root by a disc bulging or herniating in the low back area. Consult an orthopedic surgeon or a neurosurgeon who will order the appropriate imaging studies. In the meantime nsaids like Ibuprofen or Naproxen may help.

Sciatica: Pain in the distribution as you suggested describes the pattern of the nerve that travels in the leg called the sciatic nerve. The sciatic nerve is not the cause of the pain source, it is the result of an irritated nerve typically in the lumbar spine (low back) which are caused by herniated disks, spinal stenosis or degenerative disc disease requiring further evaluation by a spine specialist.