Suggest Treatment For Pain In My Hip Area And Lower Back

I have pain in my hip area and lower back that radiates down both legs. My big toe goes numb all the time. I have hip and groin area. When bending over, I feel so weak and tired in my lower back and legs. When going up stairs, I have to hold onto the railing for fear my knee gives out. I am OK going down stairs. I have muscle spasms all the time in my back and legs and feet. In fact if I sleep 5 hours without waking because of the pain, I am happy. The doctor says that it is just old age. I am a 55 year old female and am usually very active. I have a physical job which I bend, twist and lift light objects from ground level for 8 to 10 hours. After my pain elevates, I feel exhausted. It is not osteoarthritis per a rheumatoid specialist. I am told it is sprain/strain of my lower back. Hip Xrays show nothing.