I have alot of problems with my knees aching, headaches and my arms and legs going numb. I just went to the Dr. for it and he said i may have pinched nerves in my back and neck which would make my arms and legs go numb. He is sending me for an m.r.i on friday to see what the results are. I would go to your family dr. and ask for a m.r.i. to check for pinched nerves. Your symptoms sound alot like mine. I already have been diagnosed with lower back problems that cause my legs to go numb because of pinched nerves. I just never went back to get further treatment for this problem in the past up until now. Good luck and i hope this helps you at least a lil.
Hello you need to tell your doctor about your symptoms and he will probably need to rule out some conditions that may be causing this such as: like confused said a pinched nerve is possible but more total body wide conditions it may be are Osteoarthritis, rheumatoid arthritis, fibromyalgia, or the less likely condition lupus.
I Hope This Helps. Have A Nice Day.