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Thyroid problems and abnormal levels of FSH, LH, prolactin, androgen hormones or male hormones and estrogen hormones can also be the cause. Hence consult your gynecologist. May be you will benefit with hormone replacement therapy.
Numb peripheries can happen due to peripheral vascular disease or disorder of the circulatory system outside of the brain and heart. Other causes are hypothyroidism, eating disorders like anorexia, Vit B12 deficiency, Addison’s disease, adrenal causes like pheochromocytoma, anemia, Buerger’s disease, chronic fatigue syndrome and Raynaud’s disease. You will need some tests like treadmill test, color Doppler, angiography, ultrasonography and MRI (magnetic resonance imaging). Since I cannot examine you and know other related conditions you may be having, nor is a detailed history possible on net, I have listed the various possibilities that should be looked into. Please consult your PCP to run tests and examination to clinch a diagnosis.
Some old people are healthy because they keep their body healthy. The back and knee problem may be related to the drug and the body. Glucose intolerance is really sensitivity towards the glucose-sugar levels. If one actually balance the meals, glucose can be replaced with fibers containing similar materials of glucose such as stuff found in apples and pineapples. Those fruits also can cure your numbness. I hope it helps.